An IP conflict doesn't cause a Link to go down, the Link-led would be lit anyhow.
OP seems to be able to ping 127.0.0.1 ? So the Copier can ping itself.
I suspect a fauly port/RJ45 on the NIC, i mean, the physical connection to the network, not the NIC's electronics. His router sometimes gives a link-status, that would support the fault RJ45 connection theory..
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