Why is this happening?
This is caused by your school’s internet connection not being fast enough to stream videos.
Some work-arounds include:
Pausing the video (it will continue loading in the background) while you move between activities.
Connecting to your school network through a wired/cable connection, rather than WiFi, if available.
Connect to a personal WiFi hotspot (be careful about data usage/charges).
For more support on this issue, please contact your school’s IT support.