I think it's wifi related, linked to certain networks.

I haven't had a reboot for a couple of days, since I bought the phone. Then I went to Belarus for two days two days ago. Everywhere they had the Belnet wifi, every time I'd connect to it, the phone would reboot in a minute or so.

Was driving me nuts, I even reflashed, cause I thought as I was messing with it, could've been somehow related. In factory settings, connected, within a minute reboot.

I disabled wifi, and no probs. Then went to the airport, and before leaving wanted to connect to the wifi, again Belnet, and damn reboot...

Since leaving Belarus, not a problem...

This has led me to the conclusion that it's somehow network associated, don't know what could be causing it and can't test it now that I'm back.