Looks like Amvis thought an SA transaction was taking too long. The backtrace seems to indicate that SA was in Bayes.
I suspect that you have a fairly large bayes database, and this user got hit
with a bayes expiry run. Since Amvis killed SA before this could complete,
it will probably keep happening to a lot of messages until the update can
happen.
You can turn off auto-expiry and set up a cron job to do it every so often.
Loren
