i have 2 Echo Dots in the house, one of which is located in the basement. In the mornings, while I'm listening to the radio (via Tune in) on my sonos equipment in my bedroom, the volume suddenly drops right down for a few seconds and then pops back up. I've realised this is because my children are chatting to Alexa in the basement and the volume drops on any and all zones until the interaction has finished. Note: the basement and bedroom zones are not joined together at the time, they are playing different music sources. In fact, I'm not even sure that anything is being played in the basement at the time.
Best answer by Kenneth_14