Hi @MakyoM, welcome to the Sonos community, and thank you for letting us know about this. I’m sorry to hear that this has been a recurring issue with your Sonos system.
We really appreciate your time and all your effort in performing the steps to get Google Assistant working again. To help you out with this, I recommend contacting our Sonos Customer Care support team for more in-depth troubleshooting steps. Our phone support can perform real-time troubleshooting using their tools to address the issue.
Please feel free to reach out in the future if you have any other questions. You're always welcome here.