Open doors

When I moved into the house I put a settee Infront of the doors. I've never had them open for the 3 1/2 years. Now I've decided to open up just during the summer.
I have one of those Echo Alexa machines and as I was on the phone to Chris it suddenly started up in the other room playing music. Freaky! I might need to keep the door shut in case it happens again.