Have had S7 for couple of weeks, no issues until today, device seems to get hot on its own and has restarted 3-4 times in last few hrs. I'm not even using it, has been idle most of that time. I'll just look over and see that it's restarting. One of those times, all my widgets disappeared as well. Anyone else seeing this, any clues how to tell what's going on? ATT is carrier.