I find that when I play games, Windows 8.1 keeps randomly showing the desktop. It only reverts back to showing the desktop when I play games and doesn’t seem to happen when I’m doing other full screen activity like watching a video.
There’s talk on the internet of people saying that you should try turning of Aero Snap, but people are still reporting Windows 8.1 reverting to the desktop after disabling that.
I think I’ll try updating my graphics card driver and see if that helps. The only other thing I can think it could be would be my keyboard driver or settings, I have a Logitech G510S gaming keyboard.