They are as far as it being a 480 problem because if it were, we would all have it, that's just a scientific deduction.
It could be many things that are causing it in your case but acting as if everyone has this problem (which you have been doing) and blaming it on the 480 when others with 480s are not experiencing the problem are both steps in the wrong direction AFAIAC.
I'll stick to my original suggestion, get rid of your 480 if you're
not happy with it. This thread really needs to be locked at this point. It is a fountain of misinformation.