I hope someone has a solution to fix or an explanation to this issue im having on my new s20 ultra. Its running on 120hz srr. From time to time the screen sort of freezes intermittently with black blocks all over the screen. They soon disappear when the screen is refreshed. Not sure why or how its happening.
this seems like it could be a software issue. Have you tried facotry resetting your phone?
From Settings, search for and select Factory data reset. Next, tap Factory data reset again, and then review the information. When you're ready, swipe to and tap Reset. If you have a security lock set on the phone, you will be asked to enter the credentials. To delete all information and downloaded apps, tap Delete all.
Once you factory reset your phone, try to see if you can replicate the issue. If the issue does not happen again, this means it could be a third party app on your previous backups that was causing the issue. If it does happen again even after a factory reset, a further hardware replacement may be required. Thanks!