I am getting random file access problems on my network. A user clicks on a file it does not open and times out after 90 seconds. During that time it disconnects the user from all networks and shares. Once timed out the connection is re-established. Other users can access the file. It is not just one file but random files across the network. It is random but it is effecting production. I have scanned for viruses. My server is fully patched. Any help would be appreciated.