On Pocket Edition, when I join a multiplayer game it crashes after a few minutes.

When I join a multiplayer game on PE, it crashes after about 10 minutes. Both of our internet connections are fine and no other game does this. If I am the host it does not crash, but if I join any other person's game or a server my game crashes. I have already checked everything on my phone and it's in order so it's the game unfortunately.