How to Restart an Ipad

Apple has some good articles on how to perform a regular restart of the kiosk as well as if the kiosk is frozen and a force restart is needed:

Regular Kiosk Restart - https://support.apple.com/en-ca/HT210631#:~:text=Press%20and%20hold%20either%20volume,unresponsive%2C%20force%20restart%20your%20device.

Force Restart - https://support.apple.com/en-ca/guide/ipad/ipad63d30b5a/14.0/ipados/14.0#iPad715e3eec