iPad mini 4

Try rebooting your iPad, but if that doesn't work, schedule an appointment at your Apple Store Genius Bar for evaluation and options.

Press and hold BOTH the power and home buttons at the SAME time (keep holding past the swipe to power off) until the Apple logo appears, then let go.

Then you likely have a hardware issue and you should let Apple see your iPad.

Your iPad has a hardware issue.

Bring your iPad Mini 4 into your nearest, “local” Apple Store for diagnosis, evaluation and potential options.

Best of Luck to You!

No, we can't help you beyond providing Apple documents to help you and recommend if they don't help that you should schedule an appointment at your Apple Store Genius Bar for evaluation and options, which is exactly what I suggested in my first and second response to you.