Sorry for the server troubles today. I'm still not quite sure what the problem is. The server started acting like it was overloaded with traffic, but I don't see any evidence of traffic levels being any higher than normal. It's a bit of a mystery.
I tweaked the server settings a bit to adjust to this phantom traffic load, and it seems to be helping, knock on wood. But if it keeps up, I'll have to move things over to a more powerful (read: expensive) server.