I seen a post that stated to post what i was doing at the time of the issue here. I was playing on an official server and went to enter a command using the right on dpad button and opening the keyboard while typing the command the game seemed to crash at that point I went to reopen the game and the game crashes at the mojang loading screen! I have not tried the reset above yet but am going to try it right after this post. I have been trying to work on this issue for 2 days with microsoft support for xbox one and they cant figure anything out.
Update: The console reset listed above has made the game work not telling how long that the game will be working after this but I hope that the info I have added helps solve this issue!
If you are a owner of the realm and people cant get on because of this or you know the owner tell them to put the realm in peaceful let the person join then change it back to the desired difficulty. I have the same issue on my realm and this is the only way that i have found to fix it for now. The number of mobs is not the cause it it your crushers and the piston funnel that are the cause. Dont use the crushers and if a blaze gets stuck in the funnel hope that its not going to crash! Mojang Please patch this!