The last few server crashes seem to have been caused by the same bug, but it has turned out to be quite hard to track down. I need to consider my options for a bit, and since the bug causes troublesome shutdowns, I'll leave the server down in the meantime. I hope I'll think of something before too long.
In case anyone is worrying about their subscriptions ticking away while the server is down, fret not. The subscriptions are defined in terms of server uptime, so their "end date" will keep ticking up as long as the server is down.
I'm terribly sorry for the inconvenience.