Nima,
As a Roku moderator, you would be serving your users much better if you would give them the real solution to the problem. Deleting and reinstalling channels doesn’t work, as has been said here over and over again. All of the other solutions don’t work, either.
The solution is, get a Roku Basic (no 4K!) for use with Hulu. The problem appears to be a conflict between the Roku products and what Hulu is broadcasting.
You cannot “dumb down” an 4K Ultra or stick to 1080p. They accept the signal, process it for 4K, and then “dumb down” to whatever you set it to. But by then, the user has already got the audio lag. The Basic just accepts the signal and processes it for 1080p, and DOES NOT Have the audio lag.
Someone here already said it better, but it seems that the ads that Hulu is broadcasting vary in their quality, and shift back and forth from 1080p to 4K to whatever else they can think of. The Roku 4K can’t handle that.
This is not a problem that Hulu can resolve on its own. There is a serious need for Roku and Hulu to get together and work out a solution to this.
