I never hit exit. I always try to save the game and that's when the games crashes...everytime. Is there a patch available?
1.1 is the farthest it's been updates as of today, that might change tomorrow though... although, it seems people started having more issues AFTER the patch... not trying to whiz in your cheerios, but it may make your situation worse...
My advice is to get on the troubleshooting forums over at the website and see if others have issues that are similar to yours.
Good luck, let us know!
Nem'