iPad - remove white bar on screen

Make an appointment at the nearest Apple location to have your iPad evaluated for free.

Once the diagnostics are complete, the staff will explain your options.

Make a Genius Bar Reservation

https://www.apple.com/retail/geniusbar/

Or use the link below to see if Apple Support can do a remote

diagnostic on your iPad or offer other assistance:.

https://getsupport.apple.com

That might be a hardware problem but try a forced restart and see if it goes away.

Hold down on the sleep and home buttons at the same time until you see the Apple logo on the screen at which time you can let go of the buttons. The iPad will reboot.