frequent DBERROR problems with the db directory

[Ramprasad]

hi all,
  I have a imap server running cyrus 2.1.3  running on fedora core 1 
I frequently get errors like this  ( sometimes even thrice a day ) 

Nov 10 12:19:04 yyyyyy lmtpd[6258]: DBERROR:
opening /var/imap/mailboxes.db: Cannot allocate memory
Nov 10 12:19:04 yyyyyy lmtpd[6258]: DBERROR:
opening /var/imap/mailboxes.db: cyrusdb error
Nov 10 12:19:04 yyyyyy lmtpd[6258]: FATAL: can't read mailboxes file
Nov 10 12:19:04 yyyyyy lmtpd[6258]: DBERROR db4: Database handles open
during environment close

I remove all files from /var/imap/db and restart cyrus and things start
working fine
Can I solve this permanently , without having to upgrade the cyrus
server

Thanks
Ram

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