I have an Amazon Echo Dot in the basement. Wife wanted one too, so she keeps it in the kitchen. Occasionally, she wants to listen to music, so she talks to hers in the kitchen, it lights up, and... The one downstairs is the one playing. Do multiple units somehow link together? We thought maybe the one downstairs is hearing her, but if we shut the door so it can't hear, it still responds even though hers lights up.