Chromecast 2 - The issue was resolved
Para los que no reseteamos el Chromecast 2da. Generación:
A las 20:30 GMT el problema se ha solucionado al desconectar y volver a conectar el dispositivo.
Tras una actualización en pantalla con barra de progreso, el Chromecast 2da Gen ha vuelto a funcionar normalmente.
Google Home lo reconoce perfectamente y se puede nuevamente volver a transmitir como antes.
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For those of us who didn't reset the 2nd Gen Chromecast:
At 8:30 PM GMT, the issue was resolved by disconnecting and reconnecting the device.
After an on-screen update with a progress bar, the 2nd Gen Chromecast is back to normal.
Google Home recognizes it perfectly, and you can stream again as before.