my new tour will reboot sometimes several times a day. There is a flash of a white screen with wording on it but is gone so quickly, I cannot see what it says. It then takes several minutes to reboot (like a battery pull) and when it does, the date and time are wrong (usually a couple of days back).
It does it when I am scrolling through messages after just "waking it up" or sometimes sitting on my desk (it does it by itself) among other instances (just attempting to make a call).
Have you tried to do a battery pull? When you do a battery pull wait about 30 seconds before putting the battery back in and rebooting the phone.