There might not be anything wrong. Any chance: * This device has a 100Mb/s port. Perhaps something is mis-reporting on the unused pairs. * Is a modern device that supports EEE (Energy Efficient Ethernet)? It will probably drop its port speed when idle for a certain period of time if so. Do you have a spare switch you could plug into that same wall jack, and the printer into that switch for a short trial? If the CRC errors dissappear between the two switches, and move to between the temporary switch and the printer then it is something to do with the printer. I had a customer with an embedded Ethernet port on a manufacturing machine go flakey this year after a lightening storm. It worked but had intermittent CRC issues. Replacing the card resolved it in that case. Could just be a flakey Ethernet port on the printer.
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