LPT1 timeout dos printing
 

We run Dac Easy for our Point of Sale. It will only print to LPT1 for
receipts. So I have the physical LPT1 disabled and lpt1 mapped to a shared
printer on the server. Worked great for 2 years with the printer on the only
domain controller with 2003SP1. We put in a second domain controller with
2003 R2 which was set as the primary. While old DC was secondary, with the
printer still being shared on the old DC, we can open Point of Sale and print
a few receipts no problem. if we then leave POS up and come back in 20
minutes we get an error saying it cannot find the printer and a remote
downlevel document is stuck in the queue. If we close the POS app and
restart it the Remote Downlevel document clears and everything works fine
till the next time we wait 10-20 minutes before the next receipt. This is
happening on all 14 workstations.

Things I have tried:
1. Deleteing the printer from server and workstations and reinstalling it on
another server.
2. Setting the printer timeout and power saver to 1 hour.
3. Getting updated windows drivers even though the POS is using DOS printing.

Since i think this has to do with the upgrade to the R2 schema, what in
there could possibly effect this?