I was happily working today with my remote Linux m...

I was happily working today with my remote Linux machine (sorta remote...it's right over there in the corner without a monitor, keyboard, or mouse) and went off to play a game. When I came back my remote X was dead (Cygwin/X) and when I tried to restart it it failed. I rebooted the machine 2 times and still no go.
Turns out the user I was ssh-ing into had lost his home directory to root. It was owned by root, instead of himself. This seemed to happen out of nowhere, and Google shows that it's happened to other people, though they didn't know why.

So my question is, does anyone here at the lovely Gentoo forums know why this happened? I wasn't doing anything I don't normally do.
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Computer Life