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AOSP based custom ROMs stuck at roaming data on my GT-I9505

I apologise for posting this here but no-one's been able to help me with this in the ROM specific threads. I wonder if anyone else's had this problem?
My mobile data connection keeps on slipping into roaming on AOSP based ROMs (on stock it's perfectly fine). It connects normally half the time after a reboot (if it doesn't it starts at roaming), and after I turn wifi or airplane mode on and off it slips into roaming again. I have this problem with 90% of AOSP based ROMs (AOKP 4.3.1, the last stable CM 10.1.3 and CM11 port are in fact the only ones that don't have this problem). I have tried everything, and I mean everything, to get data to work normally. I've used different gapps, recoveries, earlier versions of ROMs, manually setting APNs, everything.
I refuse to believe my GT-I9505 is somehow special and ROMs don't work too well on it. Other people with GT-I9505s don't seem to have any problem with theirs.

Android L port - mobile data not working

I flashed my Nexus 4 at the beginning of the week and have been following the developers thread since then. Love it so far, great work devs. Problem I am having is (as the title states) my mobile data will not work what ever I do. Currently I am on Beta 3 Preview 5 with stock kernel and lastest TWRP. I have tried toggling the airplane mode and switching preferred network type to GSM/CDMA auto in *#*#4636#*#* and deleting the APNs and doing restore to defaults, but it still reverts to WCDMA preferred. MMS works (sending and receiving). My carrier is T-mobile, and the APN I have been selecting is the T-mobile US (epc.tmobile.com with no user, pass and server set, the rest of the settings I left on default). Any help on this would be much appreciated :laugh:

It's a preview version. It's kinda funky. I'd try reflashing. Took me awhile to get it so that I was Happy with it. Make sure it's a clean flash, wipe data, system, cache, and dalvik.
Sent from my Nexus 5 using XDA Free mobile app

I understand that, I actually fully wiped everything when I first flashed it and had to do it 3 times to get Beta 3 pre 3 to work and flashed Beta 3 pre 5 two times as well. New user so the system didn't allow me to edit my posts earlier. I will try to flash again and see if anything changes

have you checked your APN?

I have just re-flashed my phone again, tested and gone through the phone info thing, deleting and restoring the APNs again, and still is having the same problem

Here are my current settings and info. I am lost as to what else to check and change in the APN. This current setting is from T-mobile's kb article that I found dating 2013
To add, I only have 3G, but when I try to search anything in chrome it displays the T Mobile 4G page, picture is attached as well

5.9
try 5.9 stable and fast

[Q] Best modem for AOSP/CM?

I have run a bunch of AOSP/AOKP variants and am currently on Nameless ROM and what I have noticed is that there is just no way to have a stable data connection or bluetooth connection.
I have checked out a few app store apps that reset the connection when data goes down, but they do not fix the problem. I lose data, and randomely get lte in places where stock it would always be on lte. I assume it is the modem, but I have tried NAE and am now on NG2. Is this a modem issue or is there another resolution? I have read some people experience these problems on CM roms and others don't. Not sure what causes it.

[Q] No data on CM12 on my LS980

Over the last several days, I've noticed I don't have any data connectivity on my LS980, running CM12. I'm on the ZV8 radio.
Things worked fine a few days ago--I'm not really sure when it stopped working, maybe when I installed the most recent nightly (150505)? I've tried toggling roaming on and off, wiping things, reinstalling, rolling back to both CM11 and the nightly where I knew it worked (150405), all without any luck.
I can make calls and text, and wifi works just fine, but I've got no data service at all.
Any suggestions on how to troubleshoot? I'm happy to do some digging, but I don't really know where to start!

Did you figure this out
Im having this issue also

Yeah, it ended up being that some of my radio settings were jacked. If I remember right, I switched Preferred Network type from CDMA/EvDo/GSM/WCDMA to CDMA + LTE/EvDo.
And then it started working.

crazybilly said:
Yeah, it ended up being that some of my radio settings were jacked. If I remember right, I switched Preferred Network type from CDMA/EvDo/GSM/WCDMA to CDMA + LTE/EvDo.
And then it started working.
Click to expand...
Click to collapse
I guess my settings got messed up also during my latest nandroid backup.
I had another working backup......So I just flashed the old working backup, then flashed the Data only from the non working backup restore.

APN issues?

I'm currently having issues where it seems that my APN settings aren't sticking. My cellular service & data work fine until I go into an area where I lose service & then when I reenter the service area my data won't switch back on. & sometimes it seems to lose data for absolutely no reason. But if I go into *#*#data#*#* & restore default APN settings & reboot my data works again. I'm on sprints network, using screwd rom, latest milestone build, the latest bootloader, & the latest radio. I've tried update prl. Ive tried update device configuration & when i update device configuration after it finishes I lose both data & cellular service until I reboot. I've tried performing "hands free activation" which also causes me to lose cellular service until after I reboot again. I've clean flashing rom & gapps, even tho I don't think its rom related. Reflashing the latest radio IMG. My next step is restoring the device to a google stock factory img & then starting all over. Anyone who has any suggestions I would greatly appreciate the help.

Upon further research it appears to be a bug in googles code affecting aosp ROMs. Doesn't affect all aosp ROMs tho. No known fix yet