My four year old thinkpad x61 has just started shutting down spontaneously. I have no idea why, I know it's not thermal related because it's not too hot when it shutsdown and I installed lm-sensors and I can measure how hot it gets.
I recently switched to Fedora 15 (from Ubuntu) about 2 months ago, but this started happening about 10 days ago.
I've looked through /var/log/messages and haven't found anything interesting. Does anyone have any ideas?