Reconnect on wireless, but not when hard wired.

What could be the cause of the "Wireless" disconnects ?
lichess.org/learn#/ It continues to work even after a network disconnect.
But ...
lichess.org/practice Does not work when the reconnect appears.
The first move is played, the engine shows Mate #3, but the engine does not move the piece, because the reconnect appears. This happens only on the student laptops that are wireless.

If I use a computer that is hard wired in the same network (not wireless), both links are usable. No students use this desk computer. It might have a teacher password, while the laptops have a student password. Which could be the cause of limiting something ... but what? And how to fix it so it works... Does someone have a solution?

After a few search results, I read a few solutions. One of them was with the Change Advanced Power Setting from Balanced to High Performance.

It would have been great to see the Practice link behave like the Learn link.
When not logged in, the Practice link does not retain the results like the Learn link. Play something in the learn link and exit the browser. Then go back to the learn section and the stars are still there. Do the same with the practice and you will discover everything is reset like you never practiced in any section.

I am not a network technician, but at work sometimes when I connect both wired and wireless at the same time, a feedback loop is created and both connections go down.

It is possible that you are facing interference from other wifi routers operating on the same channel. You can use any wifi analyzer to detect if that's the case.

This article (www.howtogeek.com/197268/how-to-find-the-best-wi-fi-channel-for-your-router-on-any-operating-system/) can provide you the necessary technical details to troubleshoot this scenario.

HTH