LPR Printing to Marknet Pro3

We are currently in the process of converting from Novell printing to IP/LPR printing and we are forced to use both Ethernet and Token Ring print servers. There is a mixed network of Windows 9x and Windows NT dekstops and laptops. I am using both Marknet Pro 3 and Marknet XLe print servers. The problem I am having is that user setup via LPR to the Marknet Pro 3 servers will lose their connect to it once they reboot their machine. The server is at the latest firware revision and they can reliably print to a Marknet XLe server all of the time. Unfortunately I need the Marknet Pro 3 servers to work. This is only effecting the Windows NT sp6a machines. Please help in any way possible.