Farm animals disappear

I have fenced in areas in my survival world for each animal, cow, chicken, sheep, pig, dog, cat, rabbit, horse and donkey. Whenever I leave my base to explore the world when I come back a few Minecraft days later all my animals have disappeared and I have to get them all over again. If you play survival you know how much of a pain that is and I have the ps3 version and this has never happened animals never disappeared. Also both my horses that I had named and a donkey with a chest of goods in it that was named as well disappeared. Very sad when you are playing makes you want to give up but this game is the best please help with this problem it is a big issue. I have Minecraft on all platforms except the ps4 and Xbox you could say I love this game.