KI keeps crashing my PC

I bought KI and all characters as soon as they released for Windows 10. The Game itself runs fine, I have no problems selecting all characters or anything. Only when I play for more than 20-40 min the game crashes my pc without any error prompts (bluescreen, sounds of any kind…).
My specs are:
Intel i7 3770
Nvidia GTx 580
Win 10 (upgrade version)

I can play other graphically intensive games w/o any problems (Witcher 3, BF4, …)

thank you for the help in advance.