I was having frequent resets on MM 12/06. Just hard resetted the phone and using it to post atm.
I think the problem was the crap load of apps i had installed. I was having issue with Nitrogen player, when I tried to open a mp3, the phone would reboot.

I have tried many roms since I unlocked the phone from day one, and I loved them all. Still looking for the right one...
These guys r awome...