game freezes without wifi

When ever I'm on a road trip or waiting for my doctor to call me in for my appointment, I want to play minecraft. later, as I'm playing minecraft without wifi, it freezes for a long time that I couldn't play anymore. It probably crashed. I felt bored during a long road trip or while waiting to my doctor's appointment. I'm on iPad Mini 2 retina display iOS 11.

To reproduce:

1. Try playing minecraft on a road trip or somewhere without wifi.
2. While playing, it should freeze for a very long time before it crash.

Fix this plz.