I see that the lists went down on Thursday at 15:30 Us Central. That is the time and date for the last entry in the logs with no indication what went wrong. Incidentally, my airplane left Memphis at 15:25 on Thursday. So the computer gods are doing their magic.
I'll keep a close eye on the box now. If it misbehaves again, I'll move the lists to a different server. Sorry for the troubles, Mate