at first i thought the problem was the sim card communicating with the phone or the sd card. until i watched the phone and i noticed that it happened usually when the screen would turn dark * screen timeout*. thats what keeps causing it to happen. it doesnt have to do with time . it can reboot at anytime. but for some strange reason these incredible 2 phone reboot when its trying to save battery power by shutting off the screen or when u try to press the button at the top of the phone to turn off the screen. so what i did was turned off * screen timeout * . go to setting , display , then go to screen timeout and change it to * never turn off * . and let me know if that solved ur problem. it seemed to clear mines up so far.