No. It's not a solution and I whish a moderator to take of that so called "solution stample" of the thread for now.
Best regards from Sweden
Gigabyte answered: Basically, the monitor may not cause such problem. If possible, please test this monitor with other output cable or test it with other computer and see how it works. No comment...
This morning my windows just randomly booted to 640x480, driver was 21.4.1. Downgraded monitor firmware from F05 to F03, used DDU, installed 21.5.1. Now it works fine. Hoping this is not happening on every driver crash.