I had that same problem! I'd be in my kitchen where the Dot was and would say, "Alexa, set a 10 minute timer." Then I'd hear ecoAlexa in the dining room say, "Ok, a 10 minute timer...", but nothing from the Dot. Now I'm getting the opposite. I can be right next to the ecobee, but the Dot keeps responding instead. haha. It's not a big deal. As long as one responds, we're all good.