Suddenly there was a problem - 4K rollers on YouTube began to show with the brakes - there is almost no pre -load of the video. It can be seen that it preloads a little, it reaches the end of the pre -load and the video stops, then it preloads a little again, then this situation is repeated.
At the same time, on Wi-Fi on TV any rollers, broadcasts in 4K go calmly (200 Mbit after all).
I tried to turn off Avast and about the miracle, the video in 4K began to show normally, it is clear that the pre -load is going on in advance, as it should.
Added the YouTube site by the exception, but this did not help.
How to fix it?