I have the same problem.
1`st I`ve sent my GPU for warranty (gigabyte rx5600 xt gaming oc) - no issues found
second thought was (at it was the only old/unchanged part in my new build) that my PSU might be faulty - today came new one, and the problem is still there. (so 150$ thrown away)
Third, i`ve started to think that my MoBo might be faulty, but than I`ve started looking deeper in to google (just to avoid a month of waiting for my MoBo back from warranty repair with no issues found).
At this point I`m pretty sure the problem is in the drivers of my GPU.
I mean come on AMD, what the hell is wrong with this company to promote and create stuff that doesn`t work propperly?!
There are plenty of people complaining on simillar and many other issues.
How much time do you need to make it work as it should?!?!?!
Should we all just throw it in to the trash and go to your competitors?!