Ipad - keeping it up to date
All sorts of odd errors can occur if the iOS version gets too far out of date. Please Turn on automatic updates in the settings.
You can also manually force an update to the latest version in Settings - General. Updates tend to be big downloads so the time taken to update will depend on the speed of your home broadband connection. On most home connections its probably going to take a couple of hours and the ipad will not be usable during the update process.
You may find your device has insufficient space for the update to succeed. If so you need to delete stuff from your ipad memory. Unwanted photographs or videos are a good starting point.