Hi everyone,
Got a Asus RT-AX82U router and after upgrading firmware to Version 3.0.0.4.386.45934, my Sonos stopped working and there was no chance to re-connect the Sonos and or the speakers.
the only solution is to downgrade the firmware back to Version 3.0.0.4.386.45898.
The system re-connected and my Sonos works excellent again.
Please check Asus website and download downgrade/router rescue app from Asus to be able to downgrade.
Goodluck.