Game crashes

When I open Minecraft on IOS it runs well but after a minute or two the game crashes and gets off. It sucks because nothing it’s saved, mobs disappeared like my horses and all the animals in a farm disappeared, and the worst part it’s that they take the stuff you put on them. If a tool breaks before the game crashes it won’t even appear after reopening the game but it logs you to where you started before. It’s really weird and really sad, please fixed it I have lost so many things already do to this.