I picked up my ATV4 yesterday despite the concerns over this and I had a good play to see if I was experiencing it too. I have a varied library of tv and movies, encoded and from the UK and US store all stored on either my NAS or a portal hard drive and I made sure I tested a lot of stuff. My first test was a 3 hour film and I could see the film being buffered a reasonable way in front and had no stalls with it for 10-15 mins. That's as long as I tested for. All my other tests seemed to work in the same way, plenty of movie buffered up front, no pauses. Then I tried Inside Out. No matter where I started the film the buffered line kept moving forward and backward to the current point in the film and began to pause regularly. So, I tried watching it on my macbook pro, home sharing from my mini, same EXACT problem with this film. Tried on my on my iphone 6+, same problem again. It took an age to load and paused constantly on playback. This one film clearly doesn't buffer correctly. It doesn't seem to be a limitation of the ATV4 it is the film itself! Obviously it is fine on my ATV3s as they buffer differently. I noticed other people spotted this issue with Inside Out, it would be interesting to hear other peoples experiences of specific films and whether they have the same home sharing problems generally with those films, not just with the ATV4.