You might try going into a practice tool game and see if it crashes. You can even add a bot to the practice tool game, just to give it more stuff to load. The practice tool games run on the live server just like live games, so if the problem has anything to do with your connection to the server, it should crash the practice tool game just the same. I'm not giving you a solution here, I'm just suggesting a way for you to test the crash (so you can try to find a fix for it), without messing up your matchmade games. Good luck.