I have the same issue. It is very easy to tell just by listening to the choppy, stuttering audio. You don't even have to be in a game, it is very apparent even in the link home environment.
Quest 1 is unplayable via link all of the sudden. Quest 2 is playable, but the issue is still there. I've been using link for a year and have loved it so much. I've had no hardware changes.