problem solved (?) My phone also was rebooting when I wanted to use apps that required the backup assistant, like whenever I tried to start up my vznavigator. I didn't go through the trouble of rooting my phone or anything fancy - so far, all I've done is go to Settings-> Applications-> Manage -> Running -> select the Sync Service and Force Stop it. I also went into my Settings-> Accounts & Sync-> and turned off syncingBackground Data which prevents apps like the backup assistant from automatically turning on my 3G and syncing data. I haven't had any late night DROOOIDING or any rebooting to speak of for 2 night (& 3 days). Hopefully this helps other people experiencing this 2 am rebooting issue. I have the same exact problem everyone else here has been having - new software update and BAM! Constant 2 am til 5am rebooting and while using certain apps. I've tried the whole "try to get your phone to complete he update by hanging he time to force the rest of he update" only to find that that was not the case since my phone was already updated completely. This seems to be a backup assistant related issue.