[SOLVED] 4g/3g randomly disconnecting and reconnecting - EVO 4G Q&A, Help & Troubleshooting

I know there are a lot of posts about internet connection problems, but I couldn't find anything exactly like my issue.
If I only have 3g on, my Evo will connect and stay connected for a few minutes, then it will disconnect for about 20 seconds, and reconnect agaoin for another few minutes... and the cycle continues.
If I turn 4g on and 3g off, the same thing happens with the 4g.
If I have 3g and 4g on, the same things happens except sometimes 3g will be the one to connect and sometimes 4g.
Wifi works great.
My Evo is brand new and recently rooted, running Myn's Rom RLS4.
anyone had similar situation or resolutions?
THnkas!

there are only pockets of 4G so far. dont expect there to be 4G around like 3G is. as it is, 3G still isnt dat big/nation wide, but 4G is like rare. its like a needle in a haystack. the needle is 4G surrounded by the Hay/3G

Thanks,
the thing though is that my wife's unrooted Evo always maintains a strong 4g connection.
It wouldn't bother me too much the same thing happens when I use 3g. it reconnects every 5 minutes or so. Maybe rooting it caused damage?

Could flashing a different radio or wimax help?
Sent from my Evo using XDA App

Don't flash radios... that is all

For anyone with similar problem, I found my answer here and fixed my connectivity issueshttp://forum.xda-developers.com/archive/index.php/t-704845.html.
clubtech said:
I don't think it has anything to do with the ROM.
If when you are connected to 4G you can access the internet, only suddenly 4G it drops for no reason and switch to 3G and then reconnects to 4G and goes on and on, below is the solution. if when you are connected to 4G you can not access the internet at all, the below wont fix it for you and it is probably a problem with your rom.
You will need your msl code to fix this, loop up in the forums to to obtain your msl code from Sprint:
hit ##DATA# > Edit mode.
Put in your msl code
Chose WIMAX
Scroll down to Wimax_Idle_Sleep
Change the value from 10 to 300.
Click menu, commit changes and restart the phone.
This fixed it for me and i never drop 4g (when in good coverage) again.
Basically Sprint has some STUPID setting that tells 4g to go into "sleep mode" of no data is passed on the 4g connection after 10 seconds which is essentially disconnecting 4g.
The problem is it goes into sleep mode (disconnecting), but then rescans and look for a 4G signal > reconnects to 4g and if no data will be passed in 10sec it will do the same again in an endless loop.
10sec to put a connection into sleep mode is really low so change it to 300sec.
The odd thing is that this is only happening in certain locations and with certain towers.
I tried to call Sprint and explain about this issue but my attempts fell on death ears.
Go ahead and try the above. if it helps you please someone make this a sticky as you are not the first i see having the issue.
Click to expand...
Click to collapse
You'll need your msl number to do this. SImply download msl reader from the market.

Can you change any of the other settings that would make it work better?
Scan attempt
Scan retry
Thanks for this info, I gave it a try but I still cannot connect without doing a profile update and or PRL update.
Todd
chasehearn said:
For anyone with similar problem, I found my answer here and fixed my connectivity issueshttp://forum.xda-developers.com/archive/index.php/t-704845.html.
You'll need your msl number to do this. SImply download msl reader from the market.
Click to expand...
Click to collapse

Related

4g and 3g alternating

my 4g and 3g signals keep alternating..... seems like clockwork every 10 or so seconds... and im getting 2 bars of 4g.. :/
anyone else having this issue? i've tried both radio versions.
Moved as not Android Dev.
If you move to an area where your phone loses 4g then it takes a second to switch back to 3g. If your phone keeps finding and then losing the 4g signal it could do this.
It could also be exclusive to the custom ROM you are running?.. If you are..
This is when I stay still... im in philadelphia where they have 4g... right now I'm rooted.. running rooted stock Rom. No 4g data transmission at all but I believe a lot of people are having this problem with the Rom? I believe I was having a problem before I actually rooted though.. anyone else?
Not till I tried to run Fresh rom then I tried damages rom same outcome my 3g and 4g keep altering went back to my rooted stock and its good again. When I tried to flash the 4g fix it would stay in 3g and the 4g would be stuck in turning on mode this was done while on the fresh rom
I had the exact same problem. It has nothing to do with signal strength.
For some reason, the Wimax is set to disconnect after 10 seconds if idle time.
Idle time is defined by the number of seconds no traffic is passing to or from the internet.
When it disconnects, wimax will rescan and reconnect to the 4G network.
I found a fix for this, you will need your MSL code though to fix this so call Sprint and ask for it.
##DATA#
EDIT mode
Put in your MSL code.
Wimax
Change "Wimax_idle_sleep" from 10 to 300 seconds.
Click menu > commit changes.
Your phone will reboot and problem solved.
clubtech said:
I had the exact same problem. It has nothing to do with signal strength.
For some reason, the Wimax is set to disconnect after 10 seconds if idle time.
Idle time is defined by the number of seconds no traffic is passing to or from the internet.
When it disconnects, wimax will rescan and reconnect to the 4G network.
I found a fix for this, you will need your MSL code though to fix this so call Sprint and ask for it.
##DATA#
EDIT mode
Put in your MSL code.
Wimax
Change "Wimax_idle_sleep" from 10 to 300 seconds.
Click menu > commit changes.
Your phone will reboot and problem solved.
Click to expand...
Click to collapse
thanks for the post this fixed the problem for me! also i used this tut to get my msl code: http://forum.xda-developers.com/showthread.php?t=697487
now the battery life is a lot better as well thanks again
This is great. I was trying to make these modifications directly in the [mac addy].tree.xml file and they wouldn't persist. A reboot and the values I modified were reverted to their original state. I didn't realize they had to be modified here.
deonjahy said:
thanks for the post this fixed the problem for me! also i used this tut to get my msl code: http://forum.xda-developers.com/showthread.php?t=697487
now the battery life is a lot better as well thanks again
Click to expand...
Click to collapse
Worked wonderfully.. Thanks
4G in New Jersey
I get 4G in my town, bound brook, NJ. Its almost as fast as wifi.
This problem was pissing me off to no end. This procedure fixed it perfectly! removing tree.xml first did not fix it, although some people have had that help them instead. Nothing is ever consistent but in the end, something usually works.

Strange 4G behavior - beyond speed tests

I have been feeling out my 4G connection for awhile now, and I am still having a strange experience with it. Speed tests always give good results, but actually using 4G for daily tasks is not working out well so far. Often times it loads pages and market or maps slower than with 4G...
I had been having this off and on all week, but I thought it was just my poor 4g connection at home. Anyway, now I'm writing from a mall with a very strong connection. Now I'm noticing when I load a page or open maps/market, it actually disconnects from 4G and loads with 3G for a second or two then switches back..
I've been using fresh, dc, and bugless ROMs, and always with the latest radio. I've had to apply the 4G patch a few times to get 4G working, but once it's up, it behaves the same...
Is it the ROM, my phone, or the nature of 4G in philadelphia?
I'd guess it's the nature of the 4g. It's still a new market. One thing, the bars on your phone only show the connection to the tower, not the connection to the internet. My 4g has been like that in places around Dallas, but closer to the heart of Dallas, I get more consistent connection. Someone correct me if I'm wrong, but that just seems to be the nature of technology here on the bleeding edge.
I might add, that for whatever reason, I cannot load my XDA bookmark to the evo 4g page on 4g at all, but it loads fine on 3g or wifi. I have yet to understand that one. Other pages seem to load ok though.
I've also noticed issues on xda, I think it's related to flash. I noticed if I load flash only sites on 4G it never loads or takes a stupid long time... If I cut to 3G it loads fine... On xda, it's the flash ads..
Having the phone process information and display it is much different then just doing a speed test. I'm in Philly also - but only use the 4G for tethering.
rutter9 said:
Having the phone process information and display it is much different then just doing a speed test. I'm in Philly also - but only use the 4G for tethering.
Click to expand...
Click to collapse
I agree completely, but the issue is that, on some pages (usually with flash) It loads and displays the information faster on 3G than on 4G... I'm not sure what would cause that. I'll try tethering and see if it's the same... I'll also try 4G when I'm in central philly...
I wonder if flash determines what quality to stream the content at? Like if you use sprint tv on 4g you will get higher quality video but it can be laggy trying to catch up to the stream. When on 3g the quality is a little less but doesn't skip around at all.
I'm having similar issues with my 4G connection. Some pages won't come up. The progress bar loads up to about 50% then either takes a really long time to bring up the page or not at all. All I get is a blank page. The xda forums are one of the sites I'm having problems with also. It loads up fine over 3G and WiFi. I'm currently running the OMJ rom, latest Radio, and the Fresh 4G fix. I'm not sure if the problem lies with my rooted Evo or the 4G network.
rutter9 said:
I wonder if flash determines what quality to stream the content at? Like if you use sprint tv on 4g you will get higher quality video but it can be laggy trying to catch up to the stream. When on 3g the quality is a little less but doesn't skip around at all.
Click to expand...
Click to collapse
That makes sense to me. Still, it seems strange that the network or phone one struggles to keep up like that. Ah well, like I said, the nature of things out here on the bleeding edge.
i have experienced similar 4g/3g flipflopping behavior and pisspoor wifi. its like the radio is very slow to get a connection as coming out of the pocket and then while in use it will go to 3g then say it's found a 4g and get on that and back to 3g. sometimes i'll see 4g w/ full strength but am unable to do any internet functions (web browser, pandora, meebo, appbrain all fail indicating no network). by putting it into Airplane mode...count to 3...take it out of airplane mode the radio reconnects and is able to pass data as expected.
i have done full cache, delvikcache, (and the other whatchamacallit) formatting between builds. and cleared the cache after updating the radio (even tho i shouldn't need to for Fresh .3)
i have not fussed with App2SD nor anything Flash related.
not sure if i live/work on the "edge" of coverage or if it's EVO (software or hardware) related. I"m leaning more to the coverage at this point. between testing it more as i move around town and next weeks froyo builds maybe the 4g gods will shine down upon me.
Increase WiMAX_Idle_Sleep(s) setting
I had the same issue and found these instructions which show how to increase WiMAX_Idle_Sleep(s) setting.
hit ##DATA# > Edit mode.
Put in your msl code
Chose WIMAX
Scroll down to Wimax_Idle_Sleep
Change the value from 10 to 300.
Click menu, commit changes and restart the phone.
See ' [GUIDE] Easy way to get MSL without calling Sprint or using CMDA Workshop' to get MSL Code, or just call Sprint and ask for it.
mgshultz said:
I had the same issue and found these instructions which show how to increase WiMAX_Idle_Sleep(s) setting.
hit ##DATA# > Edit mode.
Put in your msl code
Chose WIMAX
Scroll down to Wimax_Idle_Sleep
Change the value from 10 to 300.
Click menu, commit changes and restart the phone.
See ' [GUIDE] Easy way to get MSL without calling Sprint or using CMDA Workshop' to get MSL Code, or just call Sprint and ask for it.
Click to expand...
Click to collapse
I work in Philly and have the 3g 4g connection problems too. Your fix did not work for me. No matter what Rom or fix I've tried I can't keep a stable 4g connection without the stock Rom flashed. Sometimes WiFi tether will work on 4g with a custom Rom but anything else and I have all kinds of connection issues. I don't think its the network because 4g connection cards work just fine.
Edit: my main cause of concern is that simultaneous talk and data. I like to be able to talk and still follow sports scores while working. Sticking to stock for now.

4G Constant Scan - connect/disconnect

I have tried to search but it doesn't like to include 4G (to short to be included) in the search box so forgive me if I wasn't bright enough to find this somewhere else.
My EVO will scan for 4G service. It then says connecting to Sprint, then flashes disconnected and scans again only to say connecting to sprint. Rinse and Repeat this process over and over. I have had this issue both on clean installs of fresh rom and currently on Koni's elite series rom. Anyone have this issue as well/and or know of a solution.
I do have a 4G MAC address so I would think that I should be able to connect.
Thanks in advance for the help
wvjw said:
I have tried to search but it doesn't like to include 4G (to short to be included) in the search box so forgive me if I wasn't bright enough to find this somewhere else.
My EVO will scan for 4G service. It then says connecting to Sprint, then flashes disconnected and scans again only to say connecting to sprint. Rinse and Repeat this process over and over. I have had this issue both on clean installs of fresh rom and currently on Koni's elite series rom. Anyone have this issue as well/and or know of a solution.
I do have a 4G MAC address so I would think that I should be able to connect.
Thanks in advance for the help
Click to expand...
Click to collapse
Well for one are you in a strong 4G coverage area?
Try shutting off your phone, pull the battery for a minute or two and restart your phone. (If you call Sprint and tell them this issue - this step will be the first one they tell you to execute)
Also you can try updating your profile and PRL, When I am having weak signals under 4G/3G - I update my profile & PRL and it always seems to fix the signal issue...
hope this helps
JS3
this happens to me when trying to connect to a 4g signal from my apartment. it will say "scanning... connecting... obtaining IP address/disconnected/scanning...connecting..." (sometimes the "obtaining ip address" does not appear) yet if i try to connect in other parts of town it connects fine. wimax sucks as far as connectivity, so until more towers appear and the signal is better there's probably no way to fix your issue. ive tried every inch of my house, and of course by the windows is slightly better. if you can manage to get a "poor" or "fair" 4g connection you'll probably end up with slower speeds than 3g anyway. it's really misleading because the software indicates the phone is trying to connect even though the signal isn't good enough to maintain a connection. clear and sprint coverage maps indicate my address and neighborhood as "best" 4g coverage too, so i have little hope of this ever improving. there is a thread for updating your ##data# values to get the phone to connect sooner and stay connected longer which i think probably helps, but not enough for me (nothing you do on your end can improve the tower signal) and even if it did, like i said you're connecting at "poor" or "fair" signal and your data speeds will often remain slower than 3g.
Sent from my PC36100 using XDA App
I am good coverage areas, my work where I am now can get it in buildings and comically my home is exactly on the line of in-home/on-street. Tried pulling the battery to same results, I think I have current PRL 60675 PRI 1.90_003. Not sure what you mean for the profile though.
Thanks for the tips.
I can connect to 4g with a poor/fair signal now, and heres how I did it if anyone cares:
flashed joeykrim's rooted stock sprint rom (5.1 I think)
updated prl through settings menu
updated profile through settings menu
use msl reader app from market to get msl code
go to dialer and type (NOT call) ##DATA#
enter MSL, go to edit mode, tap the first out of the 5 or so menu items
press menu, choose "restore" (phone will reboot or power off)
turn phone back on and enable 4g with phone on window ledge.
somewhere along the line (flashing many many different roms and wiping a lot, trying various kernels and tweaks) I had gotten stuck in the seemingly irreversible 4g/wimax connection/disconnection loop. Now I can at least connect!
Sent from my PC36100 using XDA App

Network loss

Ok guys, having a real problem here. Often when I am connected to either 3g or wifi my phone will stop picking up signal suddenly. AIt's almost every time and I will have to disconnect from the network manually and reconnect and it will instantly pick up signal again for a while then it'll repeat. When it suddenly stops it doesn't show on the status bar that I have lost any signal. With 3g its kinda just at a stand still not receiving or uploading and with wifi it just stays the same but I'm still not picking up a signal because by web pages won't load neither will other apps that require network load until I manully disconnect and reconnect. Is anyone else having a problem like this? I don't think it was like this when I firs got my phone a month ago. I'm at a loss. Any help is much appreciated. Oh I'm completely stock btw haven't rooted........(yet) lol
microdave said:
Ok guys, having a real problem here. Often when I am connected to either 3g or wifi my phone will stop picking up signal suddenly. AIt's almost every time and I will have to disconnect from the network manually and reconnect and it will instantly pick up signal again for a while then it'll repeat. When it suddenly stops it doesn't show on the status bar that I have lost any signal. With 3g its kinda just at a stand still not receiving or uploading and with wifi it just stays the same but I'm still not picking up a signal because by web pages won't load neither will other apps that require network load until I manully disconnect and reconnect. Is anyone else having a problem like this? I don't think it was like this when I firs got my phone a month ago. I'm at a loss. Any help is much appreciated. Oh I'm completely stock btw haven't rooted........(yet) lol
Click to expand...
Click to collapse
It has happened to me a couple times that I have noticed. I will be streaming music and walking and all of a sudden, nothing.
Even a soft reboot does not help. It will require a full reboot generally to solve the issue. I have not been able to identify the issue specifically. I suspect it might be related to LTE testing in my area.
What's the LTE status in your area?
No lte yet but as I stated earlier it happens on wifi too. It'll still show that the signal is connected but my pages want load at all after it happens and when I try to refresh it'll say that the webpage could not load because there is no network. Only until I manually shut off 3g or wifi in the settings and turn it back on will it pick up signal again but only for about 5 minutes. This has happened in various locations on 3g and wifi and will even happen at home wifi.
Sent from my SPH-L900 using Tapatalk 2
This has happened to me as well... A lot . Stock.. on various roms.. No lte as well.. But it's in the works
-TeaM VeNuM Like A Boss
-Galaxy Note II Edition
I've had this problem too. Sprint replaced my phone and it never happened again.
I think reactivating hands free actually fixed my problem...for now anyway. It's not losing network like it was before. All I did was enter on the phone dial pad ##72786# that'll reactivate. Hope this helps

[Q] 3G to 4G switching on sprint sucks. Is this normal?

I've found that this phone's ability to transfer from 3G to 4G data is absurdly slow, if not completely useless. It also seems that it will never switch if there is data transfer in progress. The only reliable way to make it work is to airplane for about 10 seconds, then turn it back on. If there is 4G coverage, it will come back on immediately into 4G. Now that I think about it, the same thing seems to happen going from 1X to 3G as well.
Example of a common daily routine... When I leave work and walk outside, there is full strength 4G. But the phone will be sitting on 3G from when I was inside. It will not switch to 4G unless I airplane it first to cut it off and back on. The 3G data here is literally like a dialup 14.4 modem. So it will just sit there trying to sync or do whatever its doing until the cows come home. It will never change to the readily available 15mbs 4G data.
It is so bad, I had to make a tasker function to airplane, wait 12 seconds, and turn it back on. I made it a widget called "Reset 3G/4G".
Any way to fix this crap?
Sorry if I missed it but are you stock? Or are you rooted? Or are you rooted and running stock/custom ROM? If so, what ROM?
D
DatDude123 said:
Sorry if I missed it but are you stock? Or are you rooted? Or are you rooted and running stock/custom ROM? If so, what ROM?
D
Click to expand...
Click to collapse
Rooted with the FreeGS3 ROM.
My EVO had the same behavior where it wouldn't switch from 1X to 3G if there was active data transfer. Which makes no sense. That's like not changing lanes on the highway because you'll have to look in the mirror first.
MCL1981 said:
Rooted with the FreeGS3 ROM.
My EVO had the same behavior where it wouldn't switch from 1X to 3G if there was active data transfer. Which makes no sense. That's like not changing lanes on the highway because you'll have to look in the mirror first.
Click to expand...
Click to collapse
Maybe not, but the phone has to pause the connection, disconnect one radio, start up the other, wait for it to be on, connect using that radio, and then finally resume the data transfer.
I don't expect it to happen in a matter of seconds. But what you describe should not take 5, 10, 20 minutes to accomplish. It will not switch between 1x, 3g, and 4g so long as there is data transfer in progress.
MCL1981 said:
I don't expect it to happen in a matter of seconds. But what you describe should not take 5, 10, 20 minutes to accomplish. It will not switch between 1x, 3g, and 4g so long as there is data transfer in progress.
Click to expand...
Click to collapse
True, but it may just be the apps blocking it. If theyre using it, the connection wont get dropped until it goes inactive, if I remember correctly
Here's why that makes no sense. App needs data connection. Phone in 1x with a 20kbps connection, trying to download music or photos. 3g or 4g is available. But instead of switching to it, it will just sit there until the app crashes, or tomorrow when it is done downloading.
Hmm... I'm on stock rooted MB1, and I'm also roaming at work, but there's a somewhat reliable LTE signal right outside the building, and as soon as I walk outside, I see my phone go from roaming, to not roaming, and then I see it switch to 4G in a matter of seconds. I don't need to turn on or off airplane mode or any sort of trick like that. Maybe it's ROM related? Custom kernel related? I'm not saying it is, I'm just listing possibilities.
Then again, I'm also not trying to download music or photos when I see I have a 1x connection, though my current ROM doesn't really tell me if I'm on 1x or not, so I just don't do anything network intensive when in low connection areas.
I just changed some settings in the ##DATA# menu. We'll see if that helps.

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