printing problems

I have 1 W2000 server and about 5 w98 workstations, I have a 3 port print server box hooked up and installed through the server. Everthing has worked fine for the past year. ALl of a sudden, the printers start printing garabage, from what I can see jobs are being sent to the queue from one workstation, and no one is printing from there. I clear the queues, and flush the printers memory, everthing works ok for awhile, then the same problem occurs all over again. I cant figure this one out at all!! HELP