Years ago, I had an IT guy at a customer who insisted that the NIC in a Canon iR600 was bad. He told me to replace it, or take the machine back with me and cancel the contract.
It had worked perfectly for about a week after installation, then stopped replying to print jobs or ping.
Turned out this was one time that the night cleaning people were actually to blame. They had moved the machine all of about 6 inches or so, but managed to pinch the network cable under one of its casters.
Anyone who remembers that model knows it was a total tank, weighing just slightly less than a rhinoceros.
What I'm trying to say is to not overlook such simple little gremlins that tend to make life miserable.
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