Re: Terrible ATV4 iTunes movies and trailer buffering
I had some buffering issues with locally saved iTunes purchased movies Home Sharing from my Mac to my new Apple TV prior to the latest tvOS update, but after the update they play fine. What happens now is that the name of the movie pops up on the screen while the movie buffers to start. Once it starts, it plays smoothly.
I have a 30mbps down connection, which is more than enough to play anything today. Since Internet online streaming appears to be working fine for some sources, the problem must either be local or on Apple's servers. Try streaming locally stored movies from your local Home Sharing source to other devices on your network, such as another computer, iPhone, or iPad to confirm that. If those work fine, it's not the Apple TV. Over the holidays the iTunes servers are probably being slammed. Try at different times over several days to see if the issue persists. If it doesn't, you'll know it was the servers.