I simply gave up with my printer's wi-fi, (after hours of frustration) and like you, hard wired it. I still have no idea why it would not work.
At about the same time, it decided that it did not like scanning. It will now only scan using windows fax and scan............So it has to work off the desk top, and will not speak to Apple devices.
I can't get rid of the printer as it still accepts non-branded inks!!