My n810 rebooted last night while I was asleep. It was on the charger at the time and the AC power did not go off. I've only had it just over a week and am running the latest OS 2008 as of a week ago. I also performed the reformat of the internal memory card. Of course I've also got a bunch of other apps that I am trying out. I think I had the following apps running (though idle):
GPE calendar
GPE todo list
GPE summary
simple launcher
pyculator
osso-xterm
microb
It's likely that my desktop was still ssh'd into the NIT via wifi, though that was idle.

I have the 128 MB swap enabled on the device, so I think memory should be sufficient.

My evidence for believing that it rebooted is that the wifi was not connected anymore, and there were no user-started apps running. The home-screen apps (GPE summary and pyculator) were running as usual. I think I had the device reboot on me once or twice before while I was in the early stages of getting it setup, which I dismissed as the older firmware, etc.

Has anyone else experienced this? Should I file a bug report? Any troubleshooting tips?

Thanks.