Great but big problem

I just got this for my mac and when i started to play it it worked fine. But when i played for a few hours the game froze and shut down my computer telling me that there was a problem with the game. Then when i played it the next day the game worked for and hour then did the same thing again dont know why but this game is great if it did not have that bug in it. great price but really need to fix this bug. The problem still occurs if they dont fix this i dont think i am going to ever play this because i dont wont it to damage my computer.

Shadowxx32 about Euro Truck Simulator