App keeps crashing on final

One thing I miss seeing here;

When was the last time the ones who are having issues restarted their devices?
All devices have a limited amount of system resources, RAM. The longer the device is running, the smaller it becomes over time unless you restart.

iOS is pretty aggressive on this, and always have a rather small amount available. If you’re running 3-4 apps actively in the background, all graphics maxed, haven’t restarted in a couple of days, been flying for 8hrs+ and are approaching a 3D airport - it’s not unlikely your device will run out of resources and terminate the app using the most recourses which would be Infinite Flight.