Hi @Bolanaise
Welcome to the Sonos Community!
As you’ve already tried a reset of your Sonos products, it seems there’s a problem with the link between your Google Assistant account and Sonos devices.
Please remove Google Assistant from your Sonos devices - in the Sonos app, select Settings » Services & Voice » Google Assistant » sroom name] » Remove Google Assistant.
Once that’s done, we now want to unlink Sonos from Google. Please go into the Google Assistant app and follow these steps:
- Tap the user icon in the top right hand corner of the Google Assistant app.
- Scroll down and select the Devices option.
- Tap on each Sonos device listed and select Unlink at the bottom of the options.
- Open a Web Browser on the Customer's PC/Mac and visit Google.com
- Click the user's picture in the top right, and select Manage your Google Account. If the account is not signed in, first sign in, then attempt this step.
- Ensure you see the Home tab on the left, then select Security from the options.
- Select Manage third-party access under Third-party apps with account access.
- Look under Google apps and see if there is a selection called Sonos Google Assistant Built-in Speaker. If there is, select it and select Remove Access.
With that done, please add Google Assistant back to Sonos from the Sonos app - Settings » Services & Voice » Add a Voice Assistant » Google Assistant » Add to Sonos.
If you still have issues, I recommend you get in touch with our technical support team, who have tools at their disposal that will allow them to give you advice specific to your Sonos system.
The Arc going quieter momentarily is most likely it “ducking” the volume due to it thinking it has to listen for a command. If you tap the microphone button on the Arc so the small microphone light is off, does that stop the problem? If so, I recommend you try Alexa instead - you may find “her” less sensitive to background noises.
Thanks @Corry P. I will try these and let you know how I go.