Thanks for posting here in the Google Nest Community.
I know how it feels when something isn’t working as it should. A few things: was this working before? If so, were there any changes made prior to the issue started? Do you have another Nest speaker? If so, Is it happening to the other speakers as well? What steps have you tried so far?
You can do a sequential reboot. First, unplug your Nest speakers/ displays for 30 seconds, then do the same thing to your Wi-Fi router to refresh both devices and your Wi-Fi signal.
Looking forward to your response.