I am also on my second BB 8703e (Sprint with BES) because of the rebooting problem! I eventually started getting the Device Error 348 and then I was forced to get a replacement. I have reloaded the OS on the second one a few weeks ago and it rebooted within 10 minutes afterwards! This one is now rebooting sometimes 4-6 times a day. It will reboot even while in the Holster because I will have to re login to my AmpClient application. I also have Google Maps 2.x loaded, the Antenna Software, plus the Blackberry Browser and Proprietary Software. I'm beginning to hate this phone as this is so frustrating to deal with. It's so unreliable. I like it when it works, but I hate it too! I guess you could say it's a "love-hate" relationship! Too much added stress. Sometimes it make my heart go into a racing mode (Atrial Fibrulation!). I'm not kidding! Why don't they (RIM) come out with an updated OS real soon to fix this? All my co-workers are having the same problem with rebooting.