Is it an occasional black flicker when your system is under heavy load? I updated to a new driver version, one released 27th Jan and it fixed the issue. There's still occasional flickering but it's nowhere near what it used to be. Might happen to me once a day now.
Also here's the latest optional driver info:
https://www.amd.com/en/support/kb/release-notes/rn-rad-win-20-12-2-rgb
So this is a known issue. I've been having occasional flickers and random corruption issues. It's not game breaking. But it's def annoying.