It seems now much better with the youtube version web_20201202_00_RC00.
My TV Model is GQ55Q6F.
I recommend to do the followings:
1, reset network connection
2, reset smarthub
3, reset youtube
thats great but it still broken for me. it seems the app is not able to buffer videos, and its a big problem for anything over 1080p...although even with some 1080p videos I still get pretty consistent buffering. it seems to be most likely due to the firmware as no amount of resetting has fixed it and the app has updated a couple times since the firmware update broke it, yet the problem persists.
I saw mention of using the web browser which helps as a workaround, but how do you get rid of the scroll bar on the right hand side when playing full screen?
This is exactly why I wish I could opt out of automatic updates. Another issue I consider for my next tv. I'm getting something else. Samsung is garbage. I'd feel better if they told me to go screw myself. At least do me the favor of acknowledging me