The new driver update for amd cards gave me this problem. I tried everything from changing my hdmi cable to disabling the hdmi link assurance. My monitor refresh rate kept changing from 50 hz (sometimes 24hz) when I run my games at 1080p, I have a generic monitor that has a native resolution of 1366x768 60hz but can run 1080p on 60hz easily. I tried using the old drivers (Adrenalin 2019 Edition 19.11.3 Optional) for my GPU (i have an rx 570) and voila the problem was fixed. Everything was running on 60 hz now. How can i fix this with the new drivers?