Well the problem seems very similar but my phone is always on vibrate so the phone just changes the ringer to sound back to vibrate. So the only thing im guessing is the phone doing this on it's own and not any apps.
No, the only reason i haven't tried that is because the souds are sporadic and i just won't know when it'll sound. It could be 3 4 hours in between or 12
So i think i found what the problem is. It showed up today on nice catch. It's under ringer mode history, it says "(AS.AudioService.checkforRingerModeChange)". Anyone have an idea how to fix that?