I have noticed that movies that I have bought through iTunes are not playing through smoothly through my ATV4. I always download the iTunes movies I buy to my home computer, then I stream them to my apple TV's. On the ATV4 I have noticed that the movie will pause every few minutes and "buffer", then it will play again. I can pause the movie and the progress bar will advance some but then it will stop and when I press play the progress bar will return to where the current play bar is and will play a few minutes and stop to buffer again. However if I watch the same movie through the iTunes movies app (which I assume streams from the cloud), plays just fine.