Usually there are no errors on the client side or the printer. You send the job and the printer just says processing/receiving and seems to be stuck in this loop. Trying to cancel the job on the printer side results in the printer freezing forcing a hard reboot. The interesting thing about this is that when one looks at the print queue it looks as if the entire job transferred but looking at job details on the printer it is usually not the case.
Occasionally, when you watch the job transfer it will stop sending from the PC to the printer. Say if the file is a 20 MB PDF it will just stop at 11.3 and the printer will have printed nothing and be stuck in the loop.
Also, there are times when someone prints something and nothing comes out but the log says the job printed by displaying OK next to the log entry.
We have had the service people come several times and they have provided the latest drivers and replaced the HDD in the printer.
As always, any help is greatly appreciated.