I've asked Manasa and Q to have a look at the MC in the morning. Rana and I have found it to be slightly uncooperative in relocking after a lockloss.
We have found that just letting the autolocker go doesn't seem to work very well, and sometimes the MC just doesn't want to re-lock. Closing the PSL shutter or disabling the autolocker for a few minutes (5ish) doesn't do anything, but leaving it closed for a long time (30 ish minutes) helps a lot. The MC will relock immediately after a nice long break.