Hi,
My N900 has this strange problem, which makes it pretty useless.
In short: After about a minute running it restarts.

Long version: I switch it on, enter pin code, system(desktop widgets and so on) is loading, Then appears this missed call notification in "all windows view". Then(after a second) the notification disappears. After another second appears again and so on. Finally after about a minute the phone restarts itself.

So I have a minute to find out what's going on. Any idea what should I do in this minute?