Unresponsive buttons on iPad screen

I've been having issues with the iPad application.

When running through my course I have screens where the button to trigger the action to go on to other pages become unresponsive.

The only work around I have found this is closing the app and deleting the app and reinstalling and opening the course up again.

This allows me to get past the screens I was stuck on.

Just closing and reopening the app doesn't solve this problem.

Has anyone else had this problem? Is there a fix?

Some help on this would be greatly appreciated!