X61 randomly going into sleep mode w/ Vista

[Hazarrd]

Hi All,

My x61 just started doing this. It's happened three times now. Laptop will randomly go to sleep when it's plugged in on the docking station. If i try to bring it out of sleep mode, it brings me to logon screen (normal) but i can't even get half my password in before it goes back to sleep. This repeats itself and I have to do a manual shutdown and bring things back up.

I believe it's only happened while on the docking station, but then again, I almost exclusively use it on the docking station.

Any thoughts on this? Very frustrating. Thanks!