I've also noted that my N800 was turned off for no reason when I pulled it out of my pocket. This has happened quite a few times now, and I have checked it each time to make sure it was locked before putting it away. The battery is still fully charged, so it's not that. Something is causing it to shut off on it's own now. Did they add in a new "shutdown after X time on standby" feature that we don't know about?