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Try this: Double tap the home button to bring up the app switcher. Swipe up the apps including the message app upwards to fully close them. Then tap the home button to go back to home screen. Try to open the message app and see if it opens.

Press and hold both the home and power buttons until the Apple logo appears. Release both buttuns. Wait until your iPad starts on it's own.

If it's a new iPad Pro without a home button press and hold both the power button and a volume button.

Actually if it's the new Pro models with FaceID:

Press and quickly release volume up button

Then press and quickly release volume down button

Then press and keep holding the power button until you see the Apple Logo

Have you tried a hard reset of your iPad?

Thanks for the clarification.

Anytime.

You're welcome. Try rbrylawski's suggestion before heading to the Apple Store. Good luck.