Problems here too with Sonos and Google Assistant. I have 2 x pairs of One (Gen2) and an ARC with 2 x One (Gen2) surround.
All OK until yesterday when Google Assistant stopped working on both pairs of One - remains silent when `Hey Google` spoken, as if it’s not listening. Tried reconnecting account in Google Home - no difference.
In the Sonos App (Android) under Voice Assistants, the rooms containing the pairs have disappeared and when I try to add them back in the process starts, but then keeps saying `try again`.
The Arc still works fine, so having read lots of reports of Google Assistant problems I’m reluctant to try Unlinking the Sonos account in Google Home.
Very cross as we use voice to control multiple lights, heating etc. and we’ve invested a lot of ££ in Sonos!!