crashing has definitely got worse for me. IOS 6.1.3 (this is the most updated version for my device). At the start of the day I can get about 5 minutes of game play before the first crash. After restarting, the crashing gets closer and closer together until I have to give up for a while. I don't know if it is getting worse because I am progressing and so have a larger farm or if there is a problem with the game.
I have deleted and reinstalled, which caused a mild panic when it failed to reinstall at first!! Nothing else is running at the same time, either.