Zoom crashes when sharing screen?

I hold a course for about 80 people at university, the first time online, but both my convertible (2in1 laptop), which I need to show math equations, and later my much more powerful PC shortly after I have shared the screen ( So I streamed), crashed or better said frozen, because everyone could still hear me. Does anyone know why that is?

Shortly before everything crashed, the task manager did not show a load of more than 50% for any parameter except for a high power consumption by Zoom, which is why I don't understand why it crashes

With us there were only problems if everyone had their camera on, maybe it could be because of that, but I can't guarantee, it could also be because of the internet connection