Usually if GE, fails and shuts down, it happens because of some problem in game.
I noticed that when I was working with my newest game.
I had done something wrong and the game didn't work as it should and after that when I went back to edit the game, GE crashed immediately when I hit some key. So, for making it not crash, try to find out what is wrong. I can't say more if I don't see your game.
I hope this gives you some understanding of why GE sometimes crashes.
Good luck with your game.
- lcl -