[Dovecot] 'Connection dropped by imap-server' when doing searches in

Hi,

It seems that on larger folders (32k emails) searching fails with the following error under squirrelmail 1.4.3a. (The server continues to work, as the hard drive stays on for a bit after the error is displayed)

Search Results ERROR:

ERROR : Connection dropped by imap-server. Query: SEARCH CHARSET ISO-8859-1 ALL SUBJECT {9} 5.3-BETA7 SUBJECT {9} available

Oddly enough, when searching for just '5.3-BETA7' instead of '5.3-BETA7 available' the search completes OK.

I can search with multiple strings on smaller (3k) folders however.

Thanks.