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Thanks for reaching out and welcome to the community!
I’d be more than glad to assist you with this concern.
To better understand, can you tell us more about what’s happening.
Are you getting any errors when adding Google Assistant voice service to Sonos or no devices are found during discovery?
Kindly reproduce the issue, then submit a diagnostic report through the Sonos app shortly after the issue occurs, and reply with the confirmation number. I'd start by reviewing your system as well as the status of the devices, it will help in identifying what's possibly causing the issue.