I've been having some unexplained issues with some 2003 and 2008 Servers that seem similar. I'll focus on one particular:
Server 2008, brand new from Dell in August 2011. I migrated Server 2003 and a half dozen users to it. Users have a H:\ home folder and a P:\ public shared folder.
-They seem to get disconnected from particularly the H:\ drive.
-Their My Documents is redirected to H
-They get a red X over the H mapped drive letter
-clicking on the red X can make it go away sometimes and they connect.
-They dont seem to have this problem with the P drive.
-I can re-map the drive and they're generally good until reboot, or logoff/logon the next morning when red X reappears.
-primary DNS points to the server 192.168.1.2, secondary to the router, 1.1.
On a client PC, if I drill down through My Network Places > Microsoft Windows Network > DOMAINNAME > SERVERNAME, I get an error that SERVERNAME is not accessible, You might not have permission to use this network resource, etc etc. Then if I enter \\192.168.1.2 in the address bar it goes right to it and I can click through folders. THEN, I go back and click on the SERVERNAME in the left window, I get the same error several times and finally it will let me connect after a while with the servername.
Should I be focusing in on DNS errors on the server?