T-Mobile S4 with 3rd party ROM drops connection.

[fuzzybabybunny]

I've got the T-Mobile M919 S4 and I have a 4.4.4 ROM on it (Insane Hybrid).

I've got the latest NK2 Baseband and I also don't want to upgrade to Lollipop since I did before and it was lag lag lag lag lag after a week or so.

I've noticed recently that it is getting very poor reception.

My buddy's S3 will have two bars and mine will show no service. Or it'll have bars but no data service. Or I won't be able to call out.

There also seems to be an unusual amount of spots where I have no service.

When I do have service, the data can get really really slow.

My GPS lock also frequently gets lost during navigation.

Any ideas? Do I need to flash a kernal, modem, or radio or something? Which ones?

 

[ImDonly1]

Modem = Radio
Flash them one by one until you find one that you think works best.

To me, they are all the same.
Or try a different ROM. Some of the ROMs display signal differently compared to the OEM in the status bar, but the actual signal is the same.

 

[dawheat]

I suppose the main question is whether your phone had these reception problems prior to flashing a custom ROM.

I'd start with making sure you have the newest modem, which should be separate from the ROM.

With the ROM name, I'm assuming it's still based on stock so it shouldn't have introduced reception issues besides potentially displaying different like the previous poster mentioned.

Assuming flashing the current modem doesn't help and it sounds like you have the right APN settings (still check), I don't know if there's much you can do besides Odin stock and see if the issues go away.