I have the Samsung Note 20 Ultra5g.
When I'm driving on maps and on a bluetooth call or other apps in the background, the edges of the maps screen flicker/ freeze. It's hard to switch the screen or do anything at that piont. It looks like the screen is shaking or something and you cant stop it. This is frankly dangerous and is a software issue.
The generic advice of:
1. resetting settings
2. clearing cache
is junk. I also had a brand new replacement device, same exact issue... My Note 8 works better and I have had to switch to that. If I don't get a response soon on an adequate software fix I have to return this phone outright.