I have a Sonos One connected to several other Sonos devices. When I ask for a Flash Briefing from Alexa, it plays on all of the Sonos devices that were last grouped together and not only on the device I asked the question to. This is not the desired behavior at all - all other Alexa responses are only on the device I asked the question to. This is quite bad in the morning - it can wake my whole home up to hear the news! Also the only device I can get Alexa to stop playing the briefing from is the first device that I requested it on.