I've seen on the Apple forums that this is a known issue. Allegedly it was patched in 11.1, but now as I've gone through the updates to 11.2.5 on the ATV it's stopped working. It's connected directly to the router, maybe a foot away. Internet will work for some time, then just knock out. WiFi works fine and has no issues. I'd prefer keeping it wired for the speed, but not really fond of buying an additional switch as some have recommended. Wondering if anyone over here has experienced the same issue or knows of a fix?