My Motorola Atrix (the first version) reboots itself randomly about every hour or so. I've heard that it could be because of an error with the SIM card or an app that I downloaded. But, I've done a factory reset on it many times, adding one app at a time, and that doesn't seem to be the problem. Also, I had it on the other night with my SIM card in another phone an it was still rebooting itself every hour. Any other ideas on what the problem could be?