My database cache provider is currently having an outage. No ETA on a fix yet, but they’re replacing the machine. Again. They replaced the box I was on back in January too.
EDIT: It’s back up again. They haven’t mentioned anything about data loss, so hopefully everything is still there. In any case, the database behind the cache has your saved game as of the last time you completed an encounter. As far as I know, losing the encounter in progress would be the worst-case scenario.