I love my ATV 4 but the Ethernet port packed up on it last year. It performs really well using WiFi but with a new model, I could relegate my old one to another room.
Same thing happened to my ethernet port and relegated it to the kids' playroom. Tried other cables, different ports on the switch, nothing worked. Connected a different AppleTV to the ethernet connection and it worked like a charm. It was only a month or so out of warranty too.