Hi!, I'm having the same issue here:
-Super-battery drain, specially when restarting the phone, huge 20% drops.
-Phone looses signal inexplicably,5 bars and suddenly dead, restarting solves the problem, but when signal drops, the battery starts getting HOT, even on IDLE.
-Im using Carbon 4.4.2 KitKat ROM on S3Mini I8190L.
Battery was working quite well with Cyano 11 about 3 months ago, switched to MIUI ROM because a friend recommended it, ROM started to be unstable, laggy and battery life wasn't great, had the same "signal lost" issues. Then downloaded the Carbon ROM and everything went worse.
-I always do full wipe, (davlik, data, interal storage, everything).