Massive problem printing from Yosemite to Samsung lan printer

So I have a Mac pro and a Macbook pro both networked via lan to a Samsung clp-670nd colour laser printer. Opening Printer preferences shows paper jam but the printer prints fine, however multipage jobs just continue to print over and over until the paper runs out. The printer monitor shows an error "remote host did not accept data file" with various codes 105 & 32 are a couple.

I have done loads of research on this and tried many things. I have latest firmware and driver files (apparently) I have tried reseting the print system a number of times and also repairing disks and permissions all to no avail. Single page prints work fine. Cannot discover if this is a printer problem or a Mac problem.

Can anybody help???