The game doesn't crash, it doesn't do anything.
I'll play for roughly 10 minutes, then something happens and the "Turn" button is grayed out. My mouse appears normal till I find the one unit it turns into an hourglass over. I save/reload like has been suggested in these forums, but the game becomes unresponsive and I have to kill task it. I restart the game/load and it runs fine for a few minutes before it happens again.
I'm running the latest version with all the dlc. My machine is running windows 7.