The cause was similar to the mishap on June 15:
Hosting Company wrote:At approximately 5:00 P.M. CDT, our DFW data center experienced a loss of utility power that required we fail over to generator power. During the transition, temperatures increased unexpectedly causing disruption to some customer equipment. We began to bring affected customers back online as temperatures stabilized at approximately 7:30pm CDT.
Our database server got too hot and shut down, corrupting the data. When they got the server back online the database engine wouldn't even run. Our last backup was 13 hours old, and it would have sucked to roll back the games and user accounts so far back in time. Fortunately the hosting company's database expert was able to fully recover all the data. As I requested he called me at 4:17 am to tell me it's ready so that I can add 10 hours to all games before putting the website back online.
So there you have it.
My apologies for the downtime, at least your games shouldn't be affected this time (except for speed games, please submit a support ticket if your speed game was ruined).
I'm going back to sleep now...