Hi and welcome to the Forum!
When an App plays up it's a good idea to close it completely. Do the four finger swipe up or double press the home button to reveal your multi task bar along the bottom. It will show all the apps that you have opened at one time or another. Long press the app until it jiggles and a red minus sign will appear above it. Press the minus sign, this will close the app, not delete it. It's also a good idea to close all these apps, as it helps the iPad run smoothly, I do mine every night. Check and see if it is operating now. Let us know how you go.
Sent from my iPad using iPF