I have an issue that's troubling to diagnose. The only part of town that does not get 3g/4g is at my friends house who has Wifi. My phone will constantly drop and them pick up his network - despite sitting right next to the router. When it drops, Samsung asks me to sign into my Sammy account again. Then I'll get the message that I'm connected again. It does this every 10 seconds or so. I have to use airplane mode to stop it from bugging out and burning up battery.
Doesn't happen anywhere else.
Anyway, sorry to hijack but maybe our problems are related.