Hmmm, I’ve never heard of that before have you tried holding down the power button so you can then slide to power off?
Or checking your iPads battery power maybe try it plugged in on the charger.
Also I’ve found if you have a Mac or PC you can plug the USB into the USB Port and have your Lightening Adapter plugged into the iPad. Using any computer you can search for problems you may have via youtube.
One of the quite common problems may sometimes be any iPad saying please plug in the USB for iTunes a PC or mac can fix this.
I’m guessing you could try this method just plugged into a computer and keep it on and then if it’ll let you.
1.Hold the power button and see if you can slide to power off.
2. If that doesn’t work try holding your iPad’s Home button and the Power button until you see the apple logo then let go, it should put it into recovery mode and then be able to switch both on and off.
Also if that’s the case all you’ll need will be your iPad. Good luck I hope this helps,