Hey everyone, New to the forum, so hopefully I'm in the right place! A little setup: I got my Apple TV 4K on Friday. Previously I was using 3rd generation Apple TVs in the living room and my office, and have a 4th generation in the bedroom. The only 4k TVs in the house are in the living room and my office, however the newer TV is in my office and has HDR while the living room doesn't. That being said, I still wanted to put the new 4k Apple TV in the living room. So I hooked it up to my Vizio in the living room (Vizio d58u-d3) and it defaulted to 4K SDR 60hz. Great! Everything was running fine...until I started to play HD movie files (mp4s) from the computer home sharing app (which is the reason why I have Apple TVs in every room so that our movies can go throughout the apartment). The movies were choppy for lack of a better term. I must have changed the video to every possible setting and while having it at 4K SDR 24hz helped with the movies, that meant that things on Netflix, MLB Network and WWE Network now were all coming in at what looked like 24fps. I never had any issues with my old Apple TVs being able to handle the HD movies and things like MLB Network and WWE Network without getting choppy and showing each in their appropriate frame rate. What am I doing wrong here? Do I need better HDMI cables? Am I just screwed? I tried turning on the film mode but that didn't seem to fix the problem. One last bit of information: I moved the 4K Apple TV to the newer Vizio in my office (Vizio E55-E2) and it defaulted to 4K HDR 60hz and I didn't have this issue at all. I even tried putting the 4th generation 1080p Apple TV in the living room and while that one says 1080p 60hz, again, I didn't have this issue at all. Does the Apple TV 4K just not play well with my living room Vizio? Any suggestions or help would be greatly appreciated. Thanks!