The current Dish commercial that advertises a free Echo Dot is in heavy rotation right now. Every time it plays, Alexa lights up and proceeds to answer a question - she's told me a joke, given me the weather forecast and a bunch of other things. I have to bark at her to shut up. Last night, I forgot to lower the volume after listening to music and in the middle of the night, she started shouting at me. I nearly jumped out of my skin.
Amazon and Google commercials stop the Echo and Google Home from responding (they play an interference tone or something). Perhaps you could do the same.
That's funny. I have several in different rooms. Once in a blue moon, the echo dot in my basement where I mostly watch tv, says something! I believe the tv sound confuses Alexa. But, it recognizes my accented English if I holler at her with a question when the tv is on, and she answers me.
I need to find a web site that shows voice commands that Alexa understands. If I ask her where my Amazon shipment is, she can't answer. I have to say "read my notification" when the light on the gadget is yellow!!