Tonight ClamAV shutdowned with no reason. All I can show is this particular section of the log:

Oct 31 03:09:19 localhost postfix/smtpd[28411]: B8D362F34E: client=domain.com[192.168.8.4]
Oct 31 03:09:19 localhost postfix/cleanup[28416]: B8D362F34E: message-id=<a0d75297e1e009c4b2e8683fd9f0d43f@www.testing.n et>
Oct 31 03:09:19 localhost postfix/qmgr[21668]: B8D362F34E: from=<zzzz@testing.net>, size=11121, nrcpt=1 (queue active)
Oct 31 03:09:19 localhost postfix/smtpd[28411]: disconnect from domain.com[192.168.8.4]
Oct 31 03:09:19 localhost amavis[21591]: (21591-01) ESMTP::10024 /opt/zimbra/amavisd/tmp/amavis-20061031T030919-21591: <zzzz@testing.net> -> <mail@z.domain.com> SIZE=11121 Received: from z.domain.com ([127.0.0.1]) by localhost (z.domain.com[127.0.
0.1]) (amavisd-new, port 10024) with ESMTP for <mail@z.domain.com>; Tue, 31 Oct 2006 03:09:19 +0100 (CET)
Oct 31 03:09:19 localhost amavis[21591]: (21591-01) Checking: DgKIYilYG1nt [192.168.8.4] <xxxx@testing.net> -> <z.domain.com>
Oct 31 03:09:19 localhost amavis[21591]: (21591-01) ClamAV-clamd: Can't connect to INET socket 127.0.0.1:3310: Connection refused, retrying (1)
Oct 31 03:09:20 localhost amavis[21591]: (21591-01) (!) ClamAV-clamd: Can't connect to INET socket 127.0.0.1:3310: Connection refused, retrying (2)
Oct 31 03:09:26 localhost amavis[21591]: (21591-01) (!!) ClamAV-clamd av-scanner FAILED: Too many retries to talk to 127.0.0.1:3310 (Can't connect to INET so
cket 127.0.0.1:3310: Connection refused) at (eval 45) line 268.
Oct 31 03:09:26 localhost amavis[21591]: (21591-01) (!!) WARN: all primary virus scanners failed, considering backups
Oct 31 03:09:26 localhost amavis[21591]: (21591-01) (!!) TROUBLE in check_mail: virus_scan FAILED: virus_scan: ALL VIRUS SCANNERS FAILED: ClamAV-clamd av-sca
nner FAILED: Too many retries to talk to 127.0.0.1:3310 (Can't connect to INET socket 127.0.0.1:3310: Connection refused) at (eval 45) line 268.
Oct 31 03:09:26 localhost amavis[21591]: (21591-01) (!) PRESERVING EVIDENCE in /opt/zimbra/amavisd/tmp/amavis-20061031T030919-21591
Oct 31 03:09:27 localhost postfix/smtp[28418]: B8D362F34E: to=<mail@z.domain.com>, relay=127.0.0.1[127.0.0.1], delay=7, status=deferred (
host 127.0.0.1[127.0.0.1] said: 451 4.5.0 Error in processing, id=21591-01, virus_scan FAILED: virus_scan: ALL VIRUS SCANNERS FAILED: ClamAV-clamd av-scanner
FAILED: Too many retries to talk to 127.0.0.1:3310 (Can't connect to INET socket 127.0.0.1:3310: Connection refused) at (eval 45) line 268. (in reply to end
of DATA command))
Oct 31 03:10:02 localhost zimbramon[28479]: 28479:info: 2006-10-31 03:10:01, QUEUE: 11 1
Oct 31 03:10:02 localhost zimbramon[28484]: 28484:info: 2006-10-31 03:10:01, DISK: z.domain.com: dev: /dev/hda1, mp: /boot, tot: 3753, avail:
3489