I've never had any reboots really for the most part, but now that I am home for Christmas break I've been having about 5 everyday and I believe I found out why. Everytime I get a random reboot I go to check my account and it says my Facebook account failed to sync about a minute ago which is right around the time of the reboot. This is everytime I get one. The reason I believe it never happens at college is because I don't have wifi so it's always turned off, but at home I have it turned on and when it's turned on the account trys to sync but when I'm doing nothing and my phone is locked it loses the connection and whenever it trys to sync my Facebook when its locked it doesn't have a connection and it somehow gets an error because it can't sync and therefore reboots. Now I could be COMPLETELY COMPLETELY wrong but this is just what I have noticed. So for anyone else having reboots it's something to look into. All I can truly confirm is that after every random reboot it says my facebook tried to sync a minute ago and failed to.