I’ve had the same thing happen to me more than once.
Just sitting here and suddenly I hear people talking.
When they realized their mike was on they got all excited but the guy couldn’t figure out how to turn it off apparently and one was asking the other if he thought I heard anything.
So, do you work in a sensitive industry, where there might be political intrigue going on within the company or environmental activists trying to access your communications from outside of the company?