If there is a problem with maintaining a good connection with the Classpads during a lesson, check that the antenna on the Control Hub is not obstructed by anything that could interfere with the signal and data exchange with the Classpads. If the problem affects more than one Classpad, you can try swapping Classpads with other devices available in the Docking Station.

Detailed instructions on how to swap Classpads can be found in the article: How to swap Classpads?