Drive Letter Replication

I am having a problem on my NT Server with one client workstation. The drive letter for one of the shared folders on the file server keeps replicating on the client until all letters of the alphabet are used up. For instance I have a shared serverfolder that is mapped locally to the S: drive. Over the course of several days that folder will continue to automatically map drive letters until I have an endless list from E: to Z:. This is only happening on one workstation so I assume that it is a client issue not a server one, but I am unsure. I am running NT on all workstations.