Game Crashes When I Load My Map When Connected To Wifi

When I load MCPE while connected to Wifi, my game starts up like it should, everything is fine until I try and open one of my maps. When I try and load a map the game freezes for a few second and then the game crashes. I have turned off my Wifi and started the game and tried loading a map and the map loads just fine. I can join online games and play locally with my brother but I can’t play on my own maps with Wifi on. I also tried turning my Wifi off, starting up a map and then turning my Wifi back on but when I do that, my setting change and won’t allow me to make my map multiplayer. Hope you can help! Thanks!