i5, 16G ram, W8.1, brand new GTX-970. It happens on my machine with Fallen Enchantress too. I play a lot of different games (CIV V, Witcher 3, skyrim modded), etc. and nothing ever shuts down my video card. It happens every time I play (1 out of every 4 or 5 tactical battles). I sent 2 reports to tech support.