Extremely frustrating intermitant printing problem.

We are running Suse Linux 8.2 with Samba 3.0.0.1 and Cups as our print server on a network with windows 98 and 2000 clients and HP1300, 2100, 2200 and 4050 printers. We are experiencing an intermitant error whereby the printer on the client machine will set itself to work off line and sometimes freeze up the pc when an attempt is made to print from it. This error does not happen in any consistant way an I have checked the samba and cups logs and cannot find anything which would seem to relate to the problem. I would be very grateful for any help provided by anyone who's experienced a similar problem or has any ideas how we can overcome this. Cheers Brett.