Unknown. It was online by the time I got back from class this morning so I've left it alone. Please send me a PM or email (through forums - those email me unlike Steam) if it occurs again so that I can hopefully take a peek at it while its still having whatever problem.
Update: I've found something in the logs. It looks like there was a crash from something that
@Dragonslayer7516 did, it appears to be related to a /dank/null. It was around 7:45AM ET the day of the crash. Can you give me some details about what you were doing Dragonslayer?