Since running my 4th gen ATV wireless Netflix and other apps have been flawless. Weird how I have to wire my other devices even the newest Chromecast since I have streaming issues but the ATV runs better wireless. Remember I had the same issue with the 3rd gen ATV too ran it wired for a while but had similar issues until I ran it wireless then it was also flawless.
Update my wireless is on 5ghz channel 161.