I've been having a problem with my girlfriend's 8330m. Both of us have had 8330's for a little over a month. About 2 weeks ago, her phone started rebooting once a day. After reading alot of threads here, here's what I've done so far:
OS was .131, upgraded to .169
Removed, backed up and re-formatted her 4 gig sd card.
installed quickpull and scheduled it to do a reboot daily in the middle of the night when not in use.
It still reboots!
The next two things I just did so I don't know yet if this made a difference. I read on here that sometimes 3rd party apps might not play nice so I deleted Pandora and Viigo also. She also runs her phone with Bluetooth on all of the time, even though she only uses it in the car, so I told her to try turning the BT off when she's not using it during the day.