thanks for your reply. It is just the server that has gone virtual. (vmware) The server runs as a file server on Windows 2003.
The problem is persisting, we have tried changing the auto disconnect with no luck.
Recently there were a number of users with multiple sessions . One computer had 18 sessions with 3 users i.e showing 6 sessions each. We carried out a reboot on the server however the problem returned the next day and people are still having files lock up and multiple sessions again.
Any advice is much appreciated.