Why will the printer only work when it is shut off and turned back on?

We have a network printer (HP 5000 w/ JetDirect 610N card installed) that was working just fine, but all the sudden stopped. We have several workstations pointed to this printer directly as a locally connected printer (configured a TCP/IP port on it). All the drivers are current.

What's weird is when I sent a print to the printer, the printer displays that the print device is "Ready" and there is 1 document pending. When i check out the actual print device, it says "Ready" - nothing indicates receiving data or getting a job to print. Without doing anything on the workstation that sent the print job, I physically remove the power from the print device, and re-power it up. Upon powering up, It will process the Job. It's not limited to only one job either, when sent multiple jobs, It will print those - but only when i restart the printer. Once it has been up for a few minutes it seems to not print at all until I power down and back up.


Any ideas?

Thanks for you help in advance.