HP Jedt Direct cards going bad

We have several different HP 4100 and 4200 series Printers on our network (Cisco).
On all of them we use HP Jet Direct 615n EIO cards to connect to the network.
The cards randomly just stop working, sometimes a card we just replaced a few days or weeks ago
will stop, sometimes  it's a card thats been in a printer since we go it.
Any ideas about what might cause this?
SCCHISAsked:
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☠ MASQ ☠Commented:
The 615n's are notorious for this.  HP should offer to service exchange them
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=793098
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