For the past few months, even before the release of iOS 13, I have had several dozen instances when on a telephone call in my AirPods, I will reply outloud with "Uh huh" and less frequently "Hmmmmm" and Siri will speak out as if I made a request of her. I am fairly certain that I did not precede these intonations with anything like "Hey Siri." Has anyone else noticed this behavior? When it happens, Siri is sometimes loud enough that the person with whom I am speaking hears it. These instances range from mildly irritating to almost embarrassing. Any thoughts what and why Siri is speaking up? Any way to train Siri to mind her own business?