When I enter full screen on games like Minecraft, the refresh rate becomes unstable and slow (about 1-2 hertz). All software FPS counters do report a lower framerate, but not nearly as bad as what's visible. My second screen also starts flickering (should be black when the games are in full screen), which makes me believe that the game is constantly going in and out of full screen. The issue started after a NVIDIA driver update, and reinstalling the driver did not help. It doesn't affect borderless window modes. Any ideas on how to fix this?