Can't get past the minecraft logo screen

We have a minecraft app which had been working fine up until July 20th. On July 21 my son tried to open it but the app kept shutting down. It shows the Mojang logo and then the Minecraft logo and then shuts off. I shut down the ipad and restart numerous times. I uninstalled, shut off the ipad and reinstalled a few times, but the same thing happened. When we reinstalled it got us as far as the screen with the avatar and then shut down. But that was just right after a reinstall. Every other time, it shuts down at the minecraft logo