Amavis just stops and exits

[Alex]

Hi,

I have a fedora15 server with amavisd-new-2.6.6-1 and
spamassassin-3.3.2-7 and occasionally amavisd just exits and has to be
restarted. I've found this in the logs:

Apr 20 09:35:29 mail amavis[28255]: (28255-15-5) Requesting process
rundown after 20 tasks (and 15 sessions)
Apr 20 09:35:29 mail amavis[28255]: (28255-15-5) smtp session rundown
all sessions, idle 2.1 s, smtp:[127.0.0.1]:10025, state ehlo
Apr 20 09:35:29 mail amavis[28255]: (28255-15-5) smtp session rundown,
sending QUIT
Apr 20 09:35:29 mail amavis[28255]: (28255-15-5) smtp session rundown,
closing session smtp:[127.0.0.1]:10025
Apr 20 10:38:33 mail amavis[8442]: logging initialized, log level 2,
syslog: amavis.mail
Apr 20 10:38:33 mail amavis[8442]: Valid PID file (younger than sys
uptime 14 6:55:00)
Apr 20 10:38:33 mail amavis[17612]: Net::Server: 2012/04/20-10:38:33
Server closing!

This has only happened a few times, but I really need to figure out
why it's happening. Perhaps it's a known bug with this version?

How can I troubleshoot this? Is there any further information I can
provide to help troubleshoot this?

Thanks,
Alex