This has been happening mostly since cellular data used devices got the issue that broke servers and realms for them requiring the hot-fix update to repair it. When I go into a normal world, it loads up normally as intended, but often, especially after the latest update(1.16.210), it gets to loading resources but doesn't continue afterwards. The only way I can get it to finish loading without re-launching the game is by going to the home screen then opening the app again having it have the reload screen appear. It has gotten worse after this update as I crash from attempting this a bit more often now. It doesn't at all happen while completely offline, so I suspect it being another bug with cellular data usage or something else related to internet connection.