game just locks up after a few minutes of playing

When ever i try and play automation after the past fewupdates a few minutes into building an engine or designing a body the games visuals freeze and i can't play anymore. i can still click stuff if i move the mouse around randomly and try to click things blindly but the display is completely frozen.
Specs
gtx 970
8gb 2133mhz ram
i5 3570k @ 4ghz
Specs
gtx 970
8gb 2133mhz ram
i5 3570k @ 4ghz