You might consider providing a note in the text that there is a GeoGebra applet "above/below" which may take some time to load.
Since GeoGebra is often providing their server resources for free, I am not all that surprised that there may be some delays in loading specific "free" content.
If you email me directly I can give you some email address of people who may be willing to put you in touch with people who can look into the technical aspects of what is happening on the GeoGebra side.
Note: GeoGebra's concept of commercial use includes systematic curricular use, while "in class" use a single teacher falls under non-commercial use. See: https://www.geogebra.org/license