Driver update 18.7.1 to 18.9.1 went definitely wrong.
After successfull installation and reboot I sarted constantly get message "Your hardware settings have changed. Please reboot your computer for these changes to take effect". In system event log lots of warnings Kernel-Pnp 225 appeared. XCOM 2 started to crash every 5-10 minutes of gameplay. However, subjectively game started to look better and display image smoothly. But those crashes.... playing is impossible.
Tried "Clean Install" option in AMD drtiver installer, it did not helped.
Managed to fix by reverting back to 18.7.1 via DDU.
Anyone else expierencing similar problems? Or I should use DDU and try install 18.9.1 once again?
MSI Radeon RX 480 GamingX 8G
2x4Gb Kingston DDR3
Windows 10 x64 1803