Over the past week crashed have became more frequent.

I have an ipod touch 4th gen. It used to crash a LOT, but the last few months its a lot better. I make sure that all my other apps have been closed. Click home button twice and close them. If its still bad I restart the device because that clears the RAM.

During the time it was REALLY bad I used a different app called Battery Saver or something which allocated memory and that helped the game not crash as much but since its gotten better I don't use that app anymore.

If I visit a friend's town who is house farming it will slow down tremendously and sometimes crash so I rarely visit those friends.