vsync is enabled in all examples. In the case of Doom, I believe I was using adaptive, but I tried all modes. In the case of World of Warcraft, it has a generic vsync option which is enabled.
I've tried it with multiple cables. The first cable I used was an audioquest cinnamon. Next up was a cheap HDMI that I had lying around. Both did it :(
Unfortunately, I don't have another PC ( or a console ) lying around that's capable of 4k gameplay. Because of this, I'm not being taken...
I'm concerned that my display has an intermittent physical defect. Below are videos of what occurs. I've owned this television for about eight months and during this time I have not been able to get the issue resolved either through Sony or Geek Squad. I use this display 99% as a computer...