You might have noticed a couple of periods of downtime the on the last couple of mornings. The database that runs the forum and the RS service crashed on Saturday at 2044 GMT and, thanks to @Black Hole letting me know, I restarted it at 0804 on Sunday. It crashed again this morning at 0355 (which coincides with the backup time) and was down for a while while I ran a full check and repair and it seems stable now. I'll keep an eye on it.