Bug in assaults

 
Hello, sorry, this is the first time I write and I did not know that I had to write in English.
I wanted to report a bug in my survival, the truth has been for me to do it and I would like you to help me please.
About a month ago I bought the game for xbox one I had not had any failures until this survival map that when I activate the assaults and I get close to killing the pillagers the game freezes anywhere on the map I would not want to lose my map since It took me a lot of time and effort, thanks for your attention, I hope you have a solution.
Good day