Here's a link from ASUS on updating the BIOS:
https://www.youtube.com/watch?v=scK8AP8ZACc
Also, reinstalling the drivers for the GPU may help.
Note: The above is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.