Iv had my pc, which is usually rock solid disconnecting from internet 3 times with no apparent cause, making me reboot while I've left it connected Maemo.org. didnt think much of it until i read the posts on random reboots of n900. How about using the device without web browser in background and see how long the uptime is? just a thought. I haven't received mine yet so its just my tuppence worth.

edit: seems to happen when im logged into maemo.org on pc then log in on laptop too after forgetting to log out on pc.