hai risolto? Ho lo stesso problema. Funzionava in ADSL mentre su Fibra è sempre offline.
I'm not sure to get your question... I've changed the router from "Vodafone Station Revolution" with ADSL connection, to "Vodafone Power Station" with Fiber connection (https://www.vodafone.it/portal/Privati/Tariffe-e-Prodotti/Fibra--ADSL-e-telefono/vodafone-station).
For semplicity I've maintained the same SSID and password of the wifi.
I've changed the router but the SSID and the password are the same
The problem is not the Fiber connection but the Vodafone Station router that same incompatible with Sonoff