Losing Server access

Can anyone help with this problem?
Our studio has 5 users connecting to an Xserver 10.4.5. using AFP.
Every so often any one of the users may suddenly find that they have lost the connection to the server while working on it. We can’t save back to the server or may find that any links in our files are suddenly missing. When we try to select the server icon from the finder desktop we get the “Could not be opened because you do not have sufficient access privileges”
This may only affect one or two users at any time, not all users at the same time.
Our work around option is to either trash the Server icon and then reconnect, or if that doesn’t work restart the users local computer.
This has just happened again today. I’ve been logged in for at least a couple of hours then suddenly I don’t have access. I checked the system logs on the server and on the local computer but the only thing I could find on the server was this statement which occurred around the time the connection was lost: “Server ctl_cyrusdb(8289): DBERROR: archive /var/imap/db: cyrusdb error”
G5 + iMac   Mac OS X (10.4.4)  

There is a thread (long) going in File Services forum regarding losing connections from server - don't know if your problem is related.
http://discussions.apple.com/thread.jspa?threadID=363843
Regarding the DBERROR, have a look at this thread in Mail forum...
http://discussions.apple.com/thread.jspa?messageID=659021
I think I would be tempted to address the apparent mail error first and see if that is cause or effect. If the above post is not clear on steps to take, you may want to post a question directly in Mail services.
-david

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