Spring-a-Majig keeps crashing

I am playing the Spring-a-majig pack. I’ve got to the collect 10 farm animals stage and it keeps crashing. The screen just freezes and the Minecraft app either completely closes after a minute or so, or it restarts. Also, I collected 2 animals and now all the rest of the animals have vanished. 
The pack crashes so often, I’ve had to give up.