Multiple days in a row, my LG G3 Vigor will random and frequently (sometimes 10+ times in 1 day) shut down and restart. It has done this in the middle of phone calls, surfing the net, while it's charging, or while it's just simply sitting next to me not being used! DRIVES ME NUTS!!! Then sometimes it doesn't happen at all for what seems like a week or 2! It's never hot when it happens and I rarely have multiple apps running at the same time. Any ideas?