Minecraft crashes when someone tries to join my world.

Whenever someone tries to join my world, my game crashes. When a friend tries to join, or someone tries to join over wifi, it crashes. when it crashes, it signs me out of my Microsoft account and closes the game. I have never had this issue before. I first noticed the issue about 3 days ago when my brother tried to join my world and this happened. I play on Pocket Edition, and the devices that have tried to join me were a Nintendo switch, a PlayStation 4, and another personal device.