When I watch HDR content on Netflix (e.g.: F1 drive to survive S03), after a while (less than a minute) the framerate drops down to an unacceptable level of ~3 frame per sec. If I swipe down from the upper part of the screen (notification bar appears) the lagging is goes away and the framerate of the playback goes back to normal in the background, and stays like this for some seconds. However not long after this "action", the lagging comes back as the framerate drops down to ~3fps again. If I repeat the swipe action with the notification bar thing, it goes back to normal again, but than the playback soon goes back to 3fps, and so on. Its repeatable.
Update: if I set the screen refresh rate from Auto to 60Hz, it does NOT help, and the update to 30.11.51.50 did NOT solve the issue.