[CentOS] Nightly housekeeping/Logwatch periodically not running

I've noticed something strange with a 3.4 test box that is basically just sitting here in the lab. I've got it configured to forward me the Logwatch run (which seems to go off at 4:02am by default). Every couple of days, that logwatch run goes missing. I haven't really dug down to find out if the cron job is crapping out or if postfix is dropping the report on the floor. Is anyone else having this problem? It's a completely vanilla 3.4 system with all the latest patches on a single P4 3.4ghz machine. Otherwise, the system seems to be just dandy. It's quite speedy and has never given me an instant of trouble.

*scratching my head*

Cheers,

C