I’ve now seen this happen several times…
You are watching a vendor present a demo remotely and, after about 10 minutes, the “audience” computer switches to its screen-saver. There are a few moments of thrashing as someone leaps to move the mouse – and anything that was said or presented by the vendor during that time was lost.
This repeats, of course, every 10 minutes for the balance of the session…!
Instruct your key audience member(s) to turn off their screen-saver(s) or change the setting to longer than the expected event!
(Interestingly, the presenter will most likely be unaware that the screen-saver is kicking-in on the remote computer(s)…)