I ran into this problem with my Google Home Mini. Apparently the SSID is a "set up beacon" for when the device (Chromecast, Home, or otherwise) feels like it needs to be set up again: https://productforums.google.com/forum/#!msg/chromecast/v11k1QrqLB4/FecMazwIAQAJ . I agree that it's a very poor...