GPS issue with lollipop - Sony Xperia ZL

GPS won't determine location even after is on. already checked with GPS checker and still cannot retrieve location. i encountered this issue with all lollipop roms and RR marshmallow rom even with the official sony lollipop firmware. the only rom that works with GPS is CM11 nightlies. I already ran the service test for GPS and purge assitance data, but still no results.
I will appreciate suggestions of what the problem might be and how to fix it, thank you

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Sporadic Network Service Due to Wifi

About two months ago I flashed g00h's first TW lollipop rom. In order to do that, I updated my pda and csc to NL8. My bootloader and baseband are NK3.
On touchwiz roms, I have no problem whatsoever; however, as soon as I flash an aosp rom such as Temasek's cm12 or the new pacman rom, I start to have problems related to my service and wifi. when I have wifi turned on, every now and then I'll lose service for a minute or two. Wifi continues to work, I just have no phone coverage.
Why?? I've done some searching, but the only similar thing to this seems to deal with wifi calling-this has nothing to do with wifi calling since this is an aosp rom. Additionally, my service and wifi work perfectly fine in TW roms.
If I updated all of my firmware, would that solve my problems, or just create new problems?
Thanks for any help.
Edit: I think I've fixed the issue by updating my baseband to FOB6; since updating, i haven't noticed losing service yet.
So if anyone has this same issue and finds this thread, update your baseband to FOB6.

GPS problem after custom firmware

Hi all,
I am a little bit desperated about getting my gps on my LG g3 (D855) working again. Until last month my GPS worked just okay, something it was way off but it was workable I was on stock lollipop after the OTA upgrade from Kitkat. Because of some heating problems and huge performance problems I decided to try a custom rom to see if there was increase and it worked perfectly! I noticed that my signal reception was a little bit troubling and flash some other modems to see if it improved ended with the 20p which was okay After that i tried my gps... and it wasn't able to fix anymore when wifi is on it sees 23 gps in view (GPS Test) but all with "00" signal. When turning wifi off it went back to 9 and sometimes 0. I checked the forum offcourse and found a few solutions:
-Erase modemst1 and 2 by using fastboot, didn't work
-Kitkat stock firmware, didn't work
-Lollipop stock firmware, didn't work
-Exchanged Simcard, didn't work
-Use Top NTP other program which configures gps.conf to the right NTP server, didn't work.
-Recalibrate Compass.. calibration worked but gps doesn't
-Try turning off location service, rebooting device, turning it on.. did't work
-Trying gps only or the with google services, didn't work
-Flashed almost all available modems, all the same results, 0/23 satellites and no gps fix
-Let is tryed to find a fix for like a hour but didn't work.
-Tryed latest CM firmware and Blissrom roms but all the same results.
Do you have any solutions or ideas what might be wrong?
Thanks in advance!!
Kind regards,
Toby
Open GPS Test, press the Menu button, select Update AGPS and try again.
Dear Robogo1982, Thanks for your reply! I tried it but seems not to work i also tryed the clear function and after that the update.
Try it in Flight mode.
Tried it, even with sim removed. It also seems that gsm reception is a lot worse, could it be a mechnical problem?
Flash back to stock using KDZ
Sent from my phone

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