Something very strange happened to my 580 card used on my PC with Windows 10. After the last restart, the hashrate dropped from 32 to 26 Mh. Neither Radeon settings nor Windows has any updates, since I turned them off. It is still in compute mode. It seems the problem is that suddenly the -strap X option on Claymore wich I used together with phoenix miner doesn't increase the hashrate. On the contrary, after successful loading it reduces it with 1Mh at least. I tried switching off and on the PC and plugging out the power cable, but nothing changed. I also unistalled and installed the driver in Claymore, still the same.
Edit. With Phoenixminer (without Claymore memory timings) adjusting Memory Timings Level 2 on Radeon Settings I got to 31.1Mh, but still not 32.1Mh. I can live with that of course. But it is weird.
Windows Update keeps installing incorrect driver versions, so even if mining still works, I would go to device manager and go back to previous driver version for your display adapter. Windows 11 has been REALLY obnoxious about installing driver versions that are less than optimal, but Windows 10 has that annoyance as well.