I've noticed this since I put Windows 8 and 8.1 on my Desktop PC, but it is also happening on my Laptop, which is Windows 8.1. On my Desktop, I have a NVidia 660 ti card and on my laptop, a NVidia 650m. I'll be in any game, whether it is Diablo 3, Watch Dogs, or Age of Wonders 3 and after 10-20 minutes of playing, the game minimizes to the taskbar. I then just need to click on the minimized icon to get it back. Anyone know why this is happening and how to fix it? I've dealt with this for awhile and I figured I'd ask the experts here.