cron stops silently

[Phil Brennan]

Hi,
Since updating our server to 5.4-STABLE, I've noticed a very strange
problem with cron.
Sometimes it just decides to stop, for no apparent reason. It stops at
different times, it doesn't seem to be affected by any particular
cronjob.
There are no messages about this in any logfile, it just stops running
and I have to start it manually. Obviously this is a major PITA. Can
anyone help me to debug this problem further? I really don't know
where to look. Searches of all freebsd mailing lists have turned up
with nothing.

Regards,

Philip Brennan