Sorry, I can't help, but you're not alone. My Photon has been having random restarts for a long time. I always assumed it was one of my root apps, but never nailed it down. If I did have the energy to try troubleshooting it, I would probably try freezing/uninstalling any questionable app, then I'd defrost/reinstall them one at a time.
In other threads, I've seen people advised to do a system reset to fix this issue. That's not an option for me thanks to ROM Manager having screwed up my phone.