At any point in my game (whether starting the app, navigating menus, playing in any world of any type and age, resourcepacks disabled, logged into my Microsoft account OR not) the game has a chance of crashing. Crashes happen more frequently when starting the app or navigating menus. When playing in-game the chance is lower, but still happens more than I would accept. Keep in mind this only happens on mobile, not Windows 10. My friend also experienced this issue shortly after installing the game. Re-installing also doesn't solve the problem.