My iPhone 4S has restarted automatically several times. I did nothing, just left it on the table. I noticed this again when I was watching the movie tonight. Has anyone had this issue for iPhone 4S? Another thing is my iPhone 4S turned off twice the first day I received it. Holding lock button did not work. I had to push home and lock to reset it. Should I return my iPhone? Any response in this matter is greatly appreciated.