When I am watching a youtube video on my s10 plus the speakers crackle for a split second when I turn landscapes (turning the screen). Is this normal?
I think this is a physical problem with your phone which you cannot do anything about it. I recommend you to take it to samsung customer service
Does this occur only when using youtube or with other apps as well? Can you test your device when it is in safe mode? Give this link a try to test your device in safe mode: