This is unacceptable , paid almost thousand dollars for it and now both mine and my son's phone having the same problems with ghost shadows in red.
I also just got a G S20 Ultra, just hope will not be the same problem two years from now.
Just goggle it and you will find hundreds of post with victims with same problem.
There is not app to fix the issue, only replacement of screen
SAMSUNG should make good for its customers....all my other Samsung phones still working without any problems...the problems are with the S8's