Some time ago I had such a problem: http://talk.maemo.org/showthread.php...52#post1463452

This problem has been occurring quite often (too often for it to be the cause of dirty battery pins). The N900 spontaneously reboots. Then it is running for a couple of minutes and one more reboot. It does not depend on the SIM card's presence. Neither is FS corruption since I did a complete reflash.

I had the BME replacement installed. After removing it (don't know whether correctly) with
apt-get install bme-rx-51=0.8.55+0m5 dsme-thermalobject-surface=0. 0.1+0m5 hald-addon-bme=0.0.17+0m5 libbmeipc0=0.8.55+0m5

the problem persists. Bending the golden contact points a little is to no avail, neither the metal elements holding the battery.

What might it be? Some unrepairable hw damage?