I can play the game for times between 10-30 minutes and then it stops responding and crashes.
Anyone having the same problem? Any known fix?
My Hardware is much higher than the recommended, so that isn't the issue.

There is a thread here already about that, it'd be better for you to post there so it's all in one place.
http://www.gamesas.com/index.php?/topic/1187639-crash-from-opengl-losing-connection/