Problem with printer messages

Hello,

we have lots of TCP/IP printers on our AS400, that are connected through 
special IPDS connector boxes. They all have identical
configurations, but 2 or 3 of these printers are having an intermittent 
problem.

We automatically print delivery notes  (without any user intervention) and 
paper refill requests pop up on specific terminals and are controlled
from there. 

Now some printers are sending wrong "Out of paper messages" (or the AS400 
thinks they do) and stop printing, even though they aren't out of
paper. The real problem is, that the message is not going to the specific 
terminals, but can only be answered on the print job itself.

So if nobody notices the printer stopped printing, delivery notes will 
queue up and cause late delays.

The printer joblog specifies the messages PQT3630 " Printer sent negative 
acknowledge with sense code" (CNACK101) and then message
PQT4103 which has to be answered with PAGE by the user.

I would set up a system reply list entry for PQT4103, but I don't know the 
consequences? How often does this happen and when and where else
is this message used?

The original problem could be anything from network issues, problems with 
the non-IBM IPDS converter or whatever - so I have no hope to clear up
the original issue.

Any ideas?

Thanks,

Oliver