I'm getting these, as well. They began recently after I upgraded my drivers to 21.4.1.
At the end of the day, I'll put the computer to sleep. When I wake it in the morning, I'll be greeted with the AMD Bug Report Tool and a message that says it "detected a driver timeout issue." Event Viewer reports "display driver amdkmdag stopped responding and has successfully recovered."
The computer functions normally and there are no artifacts in stress tests and no in-game crashes. It only happens upon waking from sleep.
I used DDU to uninstall the 21.4.1 driver and reinstalled 21.3.1 which was rock solid for months and months. Now the problem is occurring with 21.3.1. This makes me wonder if a Windows update has introduced a bug and that the AMD drivers are triggering it.
Anyone know if this is a "known issue" with AMD?
System details: i5-8400, 32GB RAM, Sapphire Nitro+ RX 580 SE (8GB)