I'm updated and notice the issue as well. I can tell this is an issue on how it buffers video not because of the connection. I'm playing movies directly off my Mac mini through the computer app, and also I've air played them to the Apple TV from the Mac with the same results. On the atv3, it would pull as much of the video it has space for because I've noticed if I paused in the past, there would be a ton if not all of the movie available to skip ahead quickly without rebuffering. When the atv4 stops playing, I can see it has no video stored, so it's not downloading as much as it should.
We probably need a programmer to rip open the 9.0.1 code and see what change to the code in how it buffers compared to the previous gen, that will probably give us some sort of answer.
Quite silly though, the main purpose is to stream video and its having problems with that, something that worked fine in a gen half its price. There is quite an amount of unmitigated issues with this gen out the door (no remote app, no Bluetooth keyboard support, remote won't train with many receiver's volume).
