[Q][GSM] Losing data connection all the time - Samsung Galaxy Nexus

A few weeks ago I started to have this problem; i'm ussually connected to the HDSPA network, but the phone turns data off all the time and the only way to get the signal back is rebooting (even turning on and off plane mode doesn't solve it). Calls work perfectly.
I'm on stock 4.0.4, no modified kernels or roms. My carrier is Simyo, Spain.
Sent from my Galaxy Nexus using XDA

Egoz3ntrum said:
A few weeks ago I started to have this problem; i'm ussually connected to the HDSPA network, but the phone turns data off all the time and the only way to get the signal back is rebooting (even turning on and off plane mode doesn't solve it). Calls work perfectly.
I'm on stock 4.0.4, no modified kernels or roms. My carrier is Simyo, Spain.
Sent from my Galaxy Nexus using XDA
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Click to collapse
im having the same issue here. i noticed it right away when i just got my phone today and it also has stock 4.0.4. are u on tmobile as well?

s10shane said:
im having the same issue here. i noticed it right away when i just got my phone today and it also has stock 4.0.4. are u on tmobile as well?
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No, I'm from Spain, my carrier is called Simyo, but it uses the Orange network.
Sent from my Galaxy Nexus using XDA

Egoz3ntrum said:
No, I'm from Spain, my carrier is called Simyo, but it uses the Orange network.
Sent from my Galaxy Nexus using XDA
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http://www.engadget.com/2012/04/05/gsm-galaxy-nexus-signal-problem-issue-android-4-0-4/
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s10shane said:
http://www.engadget.com/2012/04/05/gsm-galaxy-nexus-signal-problem-issue-android-4-0-4/
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That´s not my problem; the phone functions work great all the time, but data connection goes off. It happened when I was on 4.0.2 and now on 4.0.4 the issue is still there.

I too am having this same issue with a GSM Galaxy Nexus on stock yakju 4.0.4, but I'm in Canada on the Bell network, and did change the radio to the one they install on their phones.

I've been having this same problem just in the last day or two, ever since I enabled NFC. 4.04, stock kernel, calls go through as normal but no network data. When I disable NFC, everything is back to normal. Anyone else notice conflict with NFC enabled?

s10shane said:
http://www.engadget.com/2012/04/05/gsm-galaxy-nexus-signal-problem-issue-android-4-0-4/
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I believe this is with the 4.0.4 IMM76D build, it's fixed on 4.0.4 IMM76I.

Again, what the OP has reported, and I am experiencing the same, is that network connectivity does not drop, rather that at least in some scenarios (as is my experience with NFC enabled) network data drops. Really curious if anyone else out there has seen the same on the most recent build and in particular if anyone else has seen a conflict with NFC enabled.

Try matching your radio interface layer with the radio version. This app will help
https://play.google.com/store/apps/details?id=com.sibbor.getril
Sent from my Galaxy Nexus using Tapatalk 2

My baseband and RIL match. Now i'm using franco m4 but the problem persists.
Sent from my Galaxy Nexus using XDA

RIL and baseband matching here too. Thx for suggestion though. Handy little app too.

Unrelated, perhaps.
Sorry, but this might not be related: I have an issue with the phone going into 2G when I'm at work -- 23rd floor office. I must manually change it to 2G/Edge every time. All the other folks around me seem to continue without issue and are able to make calls although their signal isn't too hot. GetRIL says baseband and RIL match. I'm using XXLA2 on AT&T in NYC.
Tried searching around for a solution, but I'm not finding anything.

I had the data drop issue as well, not sure if this is related, but around the same time I matched up my RIL, I also switched from francokernel to glados. I have been using glados 1.34 & have not had the issue since.
Sent from my Galaxy Nexus using xda premium

I've noticed that data connection seems to drop when I switch apps. Does this happen to anybody else? Whenever I switch from one app to another, say from Chrome to Twitter, data connection is lost and then reconnects in about 5 to 10 seconds. There's been occasions when I've lost network signal completely and the only fix, other than to reboot, seems to be to turn airplane mode on and to turn it off again.
I have a GSM Gnex. Is this a hardware problem or will it be fixed with 4.0.5?

Related

[LTE] Grey data connectivity

Is it me or do I seem to always have an issue with data and my phone. There are many times when I go to pick it up to use and the data, either 3G or 4G, is greyed out.
I've noticed it even if I switch my phone to CDMA only.
Any suggestions on how to fix it other than the obvious reboot or airplane mode?
Unfortunately, this might just be reception issues in your area. I have no LTE problems where I live.
That's what I'm thinking. The phone may just not know what mode to chose cause I'm in between the two.
I have to bump this thread. I'm sick of this. I can hardly ever send MMS messages when I'm on WiFi.
I'm not in a 4G area, that I know. I was successful in updating my PRL which I thought fixed my issue, but didn't.
It's not like I have no signal, 1 bar, -90dBm in my house. Even switching the phone to 3G only doesn't fix this. Rebooting is my only option, as turning on airplane mode doesn't help.
Does anyone else have issues connecting to data? I'm tempted to root, just to flash a new(er) radio, but I don't feel like restoring my phone.
Have you tried updating to the new radio?
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[DELETED] Accidentally posted in the wrong thread.
No. That isn't the solution. Thus is s documented and serious problem. Its on google code and tickets have been opened with Verizon
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dudeimgeorge said:
No. That isn't the solution. Thus is s documented and serious problem. Its on google code and tickets have been opened with Verizon
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Whoops! That's what I get for opening up threads in multiple tabs. I replied to the wrong thread.
Haven't tried a new radio, still would have to root it.
As for the wifi sleep policy, it's set to always. I dunno...
shoman24v said:
Haven't tried a new radio, still would have to root it.
As for the wifi sleep policy, it's set to always. I dunno...
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Click to collapse
As for the wifi sleep policy, it's set to always. I dunno...
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Click to collapse
Yeah, that was my bad. I had multiple tabs open with different threads and posted in the wrong one.
I live in a spotty 4g area so its constantly switching from 3g to 4g and before it locks onto one signal it always does the stupid grey bar deal and sometimes it won't lock on at all even though I'm in a strong (3g) area. Restarting the phone works sometimes. All I know is that it better be fixed soon or this phone will be going back.
Sent from my Galaxy Nexus using XDA App
the_gonz79 said:
I live in a spotty 4g area so its constantly switching from 3g to 4g and before it locks onto one signal it always does the stupid grey bar deal and sometimes it won't lock on at all even though I'm in a strong (3g) area. Restarting the phone works sometimes. All I know is that it better be fixed soon or this phone will be going back.
Sent from my Galaxy Nexus using XDA App
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Yup, this is the issue I have. I can have strong 3G signal (all bars grey) but it just won't connect. Airplane mode sometimes fixes it, but I usually have to reboot the damn thing.
shoman24v said:
I have to bump this thread. I'm sick of this. I can hardly ever send MMS messages when I'm on WiFi.
.
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Turn wifi off for it to send/receive mms messages better
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wayneb02 said:
Turn wifi off for it to send/receive mms messages better
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Except the issue is... the data won't connect after I disable wifi lol. Hence why it won't even send with wifi on...
Do you live in a4g area?
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wayneb02 said:
Do you live in a4g area?
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We have 4G here in town, but I live on the outer city limits. When I get closer to town I get 4G.
I know where I live sometimes I need to reboot my phone for it to change successfully from 3g to 4g... Another thing people suggest is toggling airplane mode on and off to make it pick up signal
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wayneb02 said:
I know where I live sometimes I need to reboot my phone for it to change successfully from 3g to 4g... Another thing people suggest is toggling airplane mode on and off to make it pick up signal
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Yeah, I don't know why airplane doesn't work like rebooting usually does.
You might possibly have an actual defective phone
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wayneb02 said:
You might possibly have an actual defective phone
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I thought about taking it in and replacing it.... I don't have any reception issues, just this issue with the phone not wanting to get on data about 50% of the time.

Wonky reception, faulty radio?

Hey guys. These past few days since I flashed 4.0.4 it feels like something is amiss. I have a very shaky reception and can consider myself lucky if I have tree out of four bars, and while I have three bars, I have no connection to Google sync (the bars are grey)
My father who also has Telia (carrier) on all his phones, has perfect reception all the times without signal loss, however I'm not so lucky. My SIM card doesn't seem to be the problem, so I'm suspecting radio issues. Ever since I started to flash custom ROMs, I've been using the XXLA2 radio which came with the 4.0.4 upgrade. I currently run CM9.
How can I be absolutely sure it's the radio? I'm asking, since I'd really avoid flashing radios.
I was thinking something. I suddenly remember how I don't really run a "full" XXLA2 radio. More like a patched one. When I had flashed stock 4.0.2 yakju on my previously yakjuxw device, and I chose to upgrade through a "ripped" OTA from a guide here on XDA, I noticed the OTA "patched" the radio.
Can that be the issue? That it's patched and not really the full XXLA02 radio?
Update: I reflashed the XXLA02 radio and the problem still persists, so I don't really think it's because of the radio. I'm going to consult Telia about this to see if it's because of them. Strange, though, as my father has almost full reception all the time and he also uses Telia on his three phones.
Theshawty said:
I was thinking something. I suddenly remember how I don't really run a "full" XXLA2 radio. More like a patched one. When I had flashed stock 4.0.2 yakju on my previously yakjuxw device, and I chose to upgrade through a "ripped" OTA from a guide here on XDA, I noticed the OTA "patched" the radio.
Can that be the issue? That it's patched and not really the full XXLA02 radio?
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I'm on a full 4.0.4 radio and have always had issues. There comes a time when people need to just accept that the radio hardware sucks. Its always been like that for Samsung devices. I was always told on my Fascinate that a new radio would fix it...nope.
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Zacisblack said:
I'm on a full 4.0.4 radio and have always had issues. There comes a time when people need to just accept that the radio hardware sucks. Its always been like that for Samsung devices. I was always told on my Fascinate that a new radio would fix it...nope.
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Strange. My dad has a Samsung Galaxy S2 and no problems whatsoever. Perfect reception without signal-loss or loss of connection to Google's servers.
I can't say if I had this issue while on 4.0.2
Theshawty said:
Strange. My dad has a Samsung Galaxy S2 and no problems whatsoever. Perfect reception without signal-loss or loss of connection to Google's servers.
I can't say if I had this issue while on 4.0.2
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Click to collapse
Sorry, I'm using the LTE variant. Can't speak for the others. I know that Samsung sucks with CDMA radios. How's your WIFI reception?
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Zacisblack said:
Sorry, I'm using the LTE variant. Can't speak for the others. I know that Samsung sucks with CDMA radios. How's your WIFI reception?
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It's perfect. WiFi isn't handled by the radio, though, it's handled by the kernel. I'm going to see if this clears up by tomorrow. My carrier said they have some breakdowns, and that it was supposed to clear up by tomorrow. I'll keep my fingers crossed.
Theshawty said:
It's perfect. WiFi isn't handled by the radio, though, it's handled by the kernel. I'm going to see if this clears up by tomorrow. My carrier said they have some breakdowns, and that it was supposed to clear up by tomorrow. I'll keep my fingers crossed.
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At least there's a huge chance its not your phone lol. My reception, wifi, display, battery and sound all suck. The other 4 people I know in person that have an LTE nexus have the exact same problems.
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Theshawty said:
Hey guys. These past few days since I flashed 4.0.4 it feels like something is amiss. I have a very shaky reception and can consider myself lucky if I have tree out of four bars, and while I have three bars, I have no connection to Google sync (the bars are grey)
My father who also has Telia (carrier) on all his phones, has perfect reception all the times without signal loss, however I'm not so lucky. My SIM card doesn't seem to be the problem, so I'm suspecting radio issues. Ever since I started to flash custom ROMs, I've been using the XXLA2 radio which came with the 4.0.4 upgrade. I currently run CM9.
How can I be absolutely sure it's the radio? I'm asking, since I'd really avoid flashing radios.
Click to expand...
Click to collapse
I have the same issues.. I always have no reception at all or the bars are grey.. I've flashed every radio with no luck.. tried different roms with every radio and same result.. tried a new sim and still same crap.. I'm on tmobile USA.. I'm trying to sell the phone now..
Sent from my Galaxy Nexus using XDA
It's because of the update 4.0.4 more people have this issue. Google is working on a new update to solve this problem.
Sent from my Galaxy Nexus using Tapatalk 2
jonyang said:
I have the same issues.. I always have no reception at all or the bars are grey.. I've flashed every radio with no luck.. tried different roms with every radio and same result.. tried a new sim and still same crap.. I'm on tmobile USA.. I'm trying to sell the phone now..
Sent from my Galaxy Nexus using XDA
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Click to collapse
It is because of the update. No need to sell your phone just be patient for the new update.
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Zacisblack said:
At least there's a huge chance its not your phone lol. My reception, wifi, display, battery and sound all suck. The other 4 people I know in person that have an LTE nexus have the exact same problems.
Sent from my Galaxy Nexus using xda premium
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Sorry to hear that, bro. My phone's sound is a little dodgy, though, but I'm sure it's nothing a little tweak can't fix.
How about returning the phone for a warranty claim?
Theshawty said:
Sorry to hear that, bro. My phone's sound is a little dodgy, though, but I'm sure it's nothing a little tweak can't fix.
How about returning the phone for a warranty claim?
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Click to collapse
It's just because of the update 4.0.4 they are working hard to fix it
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The issue is due to the min CPU power being to low to support the radio. If you are rooted you can raise your min CPU level to fix the problem. Anything above 500 seems to work...
danger-rat said:
The issue is due to the min CPU power being to low to support the radio. If you are rooted you can raise your min CPU level to fix the problem. Anything above 500 seems to work...
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I'll try this, thanks. I've also verified that Telia has breakdowns which will be fixed by 5 pm tomorrow the 20th (GMT+1)
Theshawty said:
Sorry to hear that, bro. My phone's sound is a little dodgy, though, but I'm sure it's nothing a little tweak can't fix.
How about returning the phone for a warranty claim?
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Click to collapse
I get this loud lawn mower type sound when listening to music while using data. It goes basically as loud as my headphones can go and scares the crap out of me. I hardly listen to music anymore just because of it. My wifi doesn't connect to my schools network using EAP. The top half of my display has a different tint than the bottom as well as lots of banding/burn in. I go from 4 bars 3G to 1 bar and then no data at all and not being able to send texts to having 2 bars 4G and losing that in 3 minutes...I should exchange my phone huh? Lol
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The signal loss problem is a fault in the 4.0.4.
http://code.google.com/p/android/issues/detail?id=28133
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ricouno said:
It is because of the update. No need to sell your phone just be patient for the new update.
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I flashed back to stock 4.0.2 and I have the same issues.. and I almost never have signal even when NOT in standby.. right now I'm using bamf and CPU minimum is set to 700.. I'm thinking mine is hardware and not 4.0.4.. I bought the phone 3 days ago on 4.0.4 so I don't know how this phone was behaving before 4.0.4..
I'm just confused.. I've tried everything... was the reception issue only a problem on standby or all the time?
Anyone have any ideas for me to try?
Sent from my Galaxy Nexus using XDA
jonyang said:
I flashed back to stock 4.0.2 and I have the same issues.. and I almost never have signal even when NOT in standby.. right now I'm using bamf and CPU minimum is set to 700.. I'm thinking mine is hardware and not 4.0.4.. I bought the phone 3 days ago on 4.0.4 so I don't know how this phone was behaving before 4.0.4..
I'm just confused.. I've tried everything... was the reception issue only a problem on standby or all the time?
Anyone have any ideas for me to try?
Sent from my Galaxy Nexus using XDA
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Click to collapse
I just flashed yakju 4.0.2 to see if the signal strength would be better, but I'm facing exactly what you're facing.
Theshawty said:
I just flashed yakju 4.0.2 to see if the signal strength would be better, but I'm facing exactly what you're facing.
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Sucks.. hope there's a fix coming.. just ordered the galaxy note..
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[GSM/HSPA] Data connection loss

Is anybody else have problem with this? The connection often behave very strange. The only thing that "fix" this is a reboot of the mobile. Airplane mode off and on doesn't do the trick.
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With 4.0.1, 4.0.2, 4.0.4 and 4.1.1 pure stock.
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Sometimes I have to reboot the phone too to get data network to work again. I'm on stock JB.
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Yes, I experienced that. All ROMs, all basebands. Seems to be an hardware issue. My Nexus is sent in because of that right now, and I hope it gets replaced.
Oh, and: Rebooting didn't help in any way. Network was before and after just the same: Plain horrible.
Exactly like that Phantom. Is many experience this problem? Maybe everybody with a GNexus? Is this problem serious enough to get a new phone? It's quite disturbing, it feels like my mobile will never be stable.
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Hey there,
I have exactly the same problem with GNexus. Wifi works fine, but 3G randomly stops working (can't check email, facebook and browse), reboot does help, but it's very annoying to turn off and on mobile phone. Did anyone manage to fix this problem or did you get a new phone?
Same problem even on 4.2
Hey guys,
I was wondering if you got any news about this as the problem is still persistent on stock 4.2.
One difference I noticed since 4.1 is that the data connection will rapidly switch from 3G to HSPA when the loss of connection appears. It doesn't solve the problem though...
For me, it seems the issue comes when you switch from HSPA to WiFi to HSPA and from HSPA to 2G/Edge to HSPA (and maybe after a long period of HSPA).
Never had a problem in 2G so I force it to avoid the reboot most of the time but it's slow...
I used my Galaxy Nexus on Tmobile in the US and on Free Mobile in France. So it's definitely not a provider problem I guess...
But on these two data plans, I have a limit of HSPA usage (3GB) which then should force the connection to 2G. So would the usage check by the provider would somehow mess up with the data connection?
Anyway, any info on this would be greatly appreciated!
Thanks!
Max
I am having this issue as well. My roommate and we both have nexus 4 hers does not have this problem I am wondering what could be causing my phone to keep switching from 3g to HSPA + besides the sim
Sent from my Nexus 4 using xda premium
Anyone come up with a fix for this? Been searching all night and nothing useful except reboot which doesn't work. I'm getting the same problem on mine. After having the phone for a year or so, it just decided to go into this "Phantom Airplane mode" Only thing I did recently was I switched to T Mobile Straight Talk sim, because Straight Talk didn't have any more AT&T sim cards and I thought it was the sim card. This is just annoying me. lol. I tried everything, from reflashing to stock rom, to cm10.1, flashed some radios and basebands and nothing. I don't even know if I can get a replacement or fixed because it has been over a year which sucks. Any help would be appreciated. Thank you!
b0ris_ said:
Is anybody else have problem with this? The connection often behave very strange. The only thing that "fix" this is a reboot of the mobile. Airplane mode off and on doesn't do the trick.
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Click to expand...
Click to collapse
That was the problem I had with mine. I tried everything from wiping, to putting ROMs on to stock and still had the issues. Check your information like imei in your settings and if you have a lot of unknown s then you may have to send it in like I did.
Sent from my Nexus 4 using Tapatalk 4 Beta
---------- Post added at 02:00 PM ---------- Previous post was at 01:51 PM ----------
abnah said:
Yes, I experienced that. All ROMs, all basebands. Seems to be an hardware issue. My Nexus is sent in because of that right now, and I hope it gets replaced.
Oh, and: Rebooting didn't help in any way. Network was before and after just the same: Plain horrible.[/QUOTE
You will get a replacement. They did it for me.
Sent from my Nexus 4 using Tapatalk 4 Beta
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Click to collapse

Toro soft reboot

Running stock mysid JRO03O on toro GNex, experiencing not so random soft reboots where the device appears to freeze for several seconds followed the the multicolored Nexus boot logo. System uptime is not affected, battery history shows break. Seems to happen in relation to being on 4G LTE fringe area/international roaming. I do live in an area in range of Canadian wireless service and weak 4G LTE. Anyone else with these soft reboots?
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I just flashed stock this morning. Haven't had any issues switching between 3g/4g but that's probably totally different. I'll update if I have any reboots.
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I have noticed the same problem on my gnex. I too have the same build although mine is the leaked vzw so I unlocked my bootloader to flash it. Was urs stock from ota pushed directly from Verizon?
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pranilm said:
I have noticed the same problem on my gnex. I too have the same build although mine is the leaked vzw so I unlocked my bootloader to flash it. Was urs stock from ota pushed directly from Verizon?
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Both ways. I initially unlocked and installed the leaked OTA, but flashed the Google stock image as soon as it was released, thinking that it was something to do with the OTA leak. My wife's GNex has not exhibited this problem, only difference is that she has hardware version 10. What I have done in the past day is turned off the LTE setting and the problem has not repeated as of yet.
Sent from my Xoom using xda premium
Switched back to LTE/CDMA mode today, and at our kitchen table (where the reboots have always occurred and is in a location that just gets a whiff of LTE signal) the X animation popped up after about an hour of use on WiFi. Some details I've noticed - happens while in a sleep state, always in the same physical location. Also realized one additional difference between my wife's GNex and mine, the she doesn't have Google Now enabled.
Noticed in the change log for 4.1.2 on toro that the board info was changed to radio versions FF02 for CDMA and FF03 for LTE. As this reboot seemed related to LTE/CDMA switching, I wonder if the update will actually roll us back to a slightly earlier radio (I don't believe FF03 was ever rolled out with any of the updates).
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Back to square 1. Soft reboots still happening. No correlation, though occurs in relation to poor signal, app updates (always over WiFi). Reflashed stock boot loader, both radios, and boot image last night. Hopefully that does some good.
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Are you running a custom kernel?
You're sure it's a reboot? I was told once before that allot of times the graphic shell crashing is mistaken for a reboot. Considering up time is not affected, I'd say that is plausible.
WiredPirate said:
Are you running a custom kernel?
You're sure it's a reboot? I was told once before that allot of times the graphic shell crashing is mistaken for a reboot. Considering up time is not affected, I'd say that is plausible.
Click to expand...
Click to collapse
Stock kernel. Never heard of the "graphic shell crashing", but seeing the multicolored X leads me to the reboot concept.
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Appears to be 4.1.1 issue http://forums.androidcentral.com/ve...80-random-reboots-w-jb-4-1-1-stock-print.html. Guess I'll wait for an update, though may flash the 4.0.4 LTE radio and see if anything changes.
Sent from my Xoom using xda premium
Radio or location services. Reboot occurs after losing signal in remote/international border areas, while trying to negotiate reconnection. Only occurred after 4.1.1 update, so suspecting the new radios. Can't say the problem is solved, but at least I think I know what's causing the reboots.
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Call prob after official 4.3 update

My wife has this phone and I have the s3. After doin TT the update to 4.3, we both have experienced the same issue. When I am on 4g and she is on LTE, we cannot make calls to someone on WiFi calling. We can receive them just not make them. All other calls work. When on 2g or edge it works. I finally found a fix for mine, since my s3is rooted, I reflashed the modem only and mine is fixed. My wife won't let me root hers, the note 2. With that being said, what are my options, because I think that would work for hers, but she won't let me root.
Sent from my SGH-T999 using XDA Premium 4 mobile app
Make sure in wifi calling settings you have calls over wifi preferred is checked
Also do a factory reset.
That's all that comes to mind right now.
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Done both already. But try for your input. I am wondering if there was a way to flash modem on unrooted phone? Any body
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The only one that I know is this
Gordon app, just go to 1st page
http://forum.xda-developers.com/showthread.php?t=2250555
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premiatul said:
The only one that I know is this
Gordon app, just go to 1st page
http://forum.xda-developers.com/showthread.php?t=2250555
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Click to expand...
Click to collapse
It looks like you need root on it still, just no recovery.
That's what I got out of it to
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I have the same issue with my stock 4.3 Note 2... not sure what happen during the OTA but im led to assume that with all the newer LTE phones, note 2 users arent the only phones accessing those bands, and something was shifted that creates more instability with wifi calling. I say more instability, as even when I was on 4.1.1/4.1.2 there would be times when friends/family would call/message me when I was connected to certain wifi's (at my girlfriends/etc) and the call would never come through, the messages would receive until I disconneced from the wifi. Even when leaving a voicemail, it was hit or miss for me to get those until I disconnected from wifi.
Not sure if it is a compatibility issue from being connected to edge vs lte vs etc (like you have narrowed down) as it may be a wifi router issue, or just initial bugs with wifi calling in general, considering wifi calling is still (in my mind) in its infancy stage
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PhxDroid86 said:
I have the same issue with my stock 4.3 Note 2... not sure what happen during the OTA but im led to assume that with all the newer LTE phones, note 2 users arent the only phones accessing those bands, and something was shifted that creates more instability with wifi calling. I say more instability, as even when I was on 4.1.1/4.1.2 there would be times when friends/family would call/message me when I was connected to certain wifi's (at my girlfriends/etc) and the call would never come through, the messages would receive until I disconneced from the wifi. Even when leaving a voicemail, it was hit or miss for me to get those until I disconnected from wifi.
Not sure if it is a compatibility issue from being connected to edge vs lte vs etc (like you have narrowed down) as it may be a wifi router issue, or just initial bugs with wifi calling in general, considering wifi calling is still (in my mind) in its infancy stage
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I wouldn't necessarily say WiFi calling is in its infancy. I've been with T-Mobile since before the first android. We had Wi-Fi calling with the 2nd android phone T-Mobile had, the cliq 1. Every phone we have had has had Wi-Fi calling since. The first hiccup we ever had was with the HTC one s. With the note 2 we haven't had a problem until the update. Being an IT tech, I couldn't help but do my own ts, since it was happening to my s3 as well. What we found was it only happens if she makes a call on 4g or LTE going to a phone that has Wi-Fi calling turned on. If that person turns it off and goes to where they actually has signal, the call goes thru fine. My s3 was doing the same, but it is rooted.
We have put several calls into T-Mobile IT dept. That has stumped them badly. They have no idea why this is happening.
On my phone, I finally had the bright idea to reflash just the modem. It worked. No more issues on mine.
I can't root hers(she won't let me), and I know that will fix it by flashing the modem only.
So, sorry for long post, but that is where I'm at. I'm stumped, unless maybe just using Odin to flash the update all over again (like that will happen, she don't like it when I play with her phone).
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