@Sven No that’s not what I meant. What sometimes happens here is that the HDMI Ultra HD port setting seems to change from “Optimal Auto Game 120 Hz Pro” to “Standard”. I notice this because my Nvidia Shield is then not able to use Dolby Vision anymore (the option just disappears from the Shield’s menu). If I check the setting in the TV’s user interface, it is still on the 120 Hz setting, but I need to switch to another setting and then back again before my Shield will do Dolby Vision again.
I don’t recognize your problem with stuttering. Everything plays fine for me. I have the motion set to “Movies”. Anything higher exhibits the “soap opera effect” and my eyes cannot handle that :)