It seems it has improved at first after the BIOS Update but the issue is still there.
The improvment is that it happens a little less frequently on some Games (but other Games still have it almost every 5 - 10 minutes). Also the issue now sometimes shows as a black flicker which could suggest it tries to switch between the Intel internal graphics card and the Nvidia card maybe? Eventhough I set to use Nvidia for maximum performance in the Nvidia Control Panel.