Hello Stegsy and welcome to the forum. Just to check that you followed the right sequence for a reset of your iPad as per Tim's suggestion (of nearly four years ago, but which still holds good today). Did you carry out the following steps?
Simultaneously hold down the On/Off and Home buttons until the screen blacks out. Don't let either go but keep holding down both buttons until the Apple logo appears and then let both go. Then wait until your wallpaper appears. Restart your iPad.
If you did do that...my apologies.
Another, somewhat more drastic thing you can do is Reset All Settings. You'll find this under Settings > General > Reset > Reset All Settings. It won't erase any of your content, apps, or accounts; but you will have to go through most of your other settings and re-tweak them back to what they should be.
Come back to let us know if you're still having that problem. There will be a solution I'm sure

Regards, Andrew