[Dovecot] Broken Pipe

Since upgrading to dovecot 1.0.5, I started to see the following error in maillog:

dovecot: IMAP(username): Connection closed: Broken pipe

Any insight that anyone can offer would be greatly appreciated. I've attached a complete list of all dovecot log entries in maillog in the hope that it will help you identify the issue.

Thanks in advance.

Joseph D. Wagner