You can close the app and relaunch it. Turning off your iPhone and restarting are also OK. Or you can try an iOS sytem repair tool like TunesKit to fix iOS- or software-related issues.
Hope you have solved your iPad issues.
To fix app crushes, you could delete and reinstall the app, force restart the iPad or resort to an iOS System Recovery software like TunesKit to fix app crushes.
Customer support service by UserEcho