Please be more specific and explain what you mean with
"losing their mapped drives". For example, what do you
see when you run the following command from a Command
Prompt on one of the affected machines?
The server in question is a Dell 1850 Poweredge running Windows 2003 SP1.
The clients lose connections to all mapped drives from this server
(FP-OPC-02).
The mapped drives connecting to other servers remain.
Running ipconfig /flushdns and ipconfig /registerdns seems to temporarily
remedy the situation.