Hi and welcome to the Forum!
Have you tried the immediate fixes such as closing out your apps? To do this, double press the home button until the apps show as thumbnails. Swipe upward to close each app out.
If that doesn't work, try restarting your iPad. To do this, press the power button until you get the lock screen to power off. Re-test to see if that helped.
Finally, if all else fails--do a reset. To do this, press the power button and home button at the same time until your iPad shuts down. It may take a few seconds, so be patient.
Good luck!