Using Vista and iTunes 184.108.40.206 the OS will just shut off (no blue screen, no warning of any kind) on my docked TSeries ThinkPad. I mention iTunes because it seems to happen most often when downloading large files (like podcasts). It happens 2-3 times a week and I download podcasts daily so it's not too terrible. But I was hoping someone somewhere has seen this behavior. I have yet to come across anybody complaining about this with recent versions of iTunes.
Thoughts on how to pinpoint the problem would be greatly appreciated also.