Turning on the imapproxy seems to have helped. It's been on now for 5 days, and we haven't had any problems (except that /var/log/zimbra.log is full of perdition entries, how can I turn debug mode off? :-) ).
It may also be 3.1.1 is better than 3.1.0. We just updated to 3.1.1 last week, a couple of days before the incident I mentioned above.
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Scott Hanson
Media Ventures GmbH
Cologne, Germany
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