Xbox one crashing when playing online

Constant crashes when playing online with friends. I am not the host. Game crashed when mining a colored shulker box full of "my best stuff". On reentry (after host exited Minecraft and reentered) the shulker box was not in the world. Lost SO much good stuff... Sigh.

 

We are playing in survival, xbox one, I was in the end finding elytra.

 

Tonight we were disconnected 4 times (host crashed 4 times)

 

Also the crashes, if someone has died, picked up their stuff and then the game crashes seems to be duplicating the dropped items.