My Samsung Galaxy S7 (SM-G930F, Exynos/International model, LineageOS 15.1) has developed a weird fault. Has anyone heard of this or able to suggest ideas for troubleshooting/fixing?
Everything works 100% except that it randomly disconnects on phone calls. Often within seconds to a few minutes, sometimes while connecting the call or waiting to have it picked up. It doesn’t seem to matter who initiates the call. There’s no other symptom and everything else (including data connectivity) seems to work properly. Its consistent (every call). I have to call back each time, and several times to complete the conversation. It started around New Year 4 months ago, but I don’t remember any accidents. The glass is intact all around, and it’s always been in a TPU protector + glass screen protector case.
I’ve never had a SIM card error that I know of, nor any alerts about a SIM issue, and it doesn’t seem to be related to vibration, as I’m often handholding it indoors at the time, which to me, suggests it’s not an issue with the SIM tray contacts.
The only hint I have is that it seems to disconnect less if I am stationery or more when I change location – if I pace up and down or walk from room to room, it seems to be more prone to disconnect, but this could be just me imagining it as I try to find a way to work around the issue. Or could hint at antennae issues???
I’ve tried a new SIM (no effect), network operator says its not their side, reinstalled same OS (lineage 15.1) as used before that time (no use). It seems nothing left except a hardware issue, but who can tell.
I know there are logs for these things, and I’m used to log dumps on other platforms, but they’re long, and not sure what to look for. Ideally I’m looking for a way to tell what the system thinks has caused the disconnection.
In brief, how can I narrow down the cause, and is there anything else I can do to determine if it’s fixable, without returning to Samsung?