Airplay isn't smooth enough to use for the audio of a TV, it won't sync properly with the video.
?
Are you sure it's not your network connection? How far away from your router is the Apple TV?
I have two at home and both sync audio perfectly for Netflix, Amazon Prime and Sky Go when required (as well as YouTube obvs).
@Sumo started
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Airplay isn't smooth enough to use for the audio of a TV, it won't sync properly with the video.