im not sure if thats a root problem or just a devour problem, mine is unrooted(for now) but it reboots all the time, im on my second and its already done it 3 times this week, last phone i was up to 4 or five times per day. it got worse with time.
if it is due to having rooted the devour it may be due to overclocking, have you done that? the voltage difference might force the phone to reboot as a safety net.