Crashes

Every time I load one of my worlds my game crashes and goes to the home menu of my device. I can only log into the world for about a minute only. It does it to my whole game. If I have a texture pack on the world when I go to load it it says downloading textures then once it is done it goes to the main menu of MineCraft. I try to rejoin the world the it won’t even load again until I restart the game and remove the texture pack then it does the first thing I mensioned.