Crashes after 10-15 min causing loss of animals

I have had the problem of the app crashing every 10 - 15 mins causing my animals to despawn. I have lost sheep, pigs, cows, and horses with armor, all that have been tamed and in pens. It is quite frustrating to only be able to play for a few minutes at a time, especially in multiplayer over wifi. I don't have any add ons installed, it is totally vanilla.