I have a brand new ET8 system. When it was set up, it used 6GHz as the wireless backhaul. It started out with a "Great" connection, then dropped to "Ok" after about and hour. While "Ok" on 6GHz is worked great. Now I just discovered it has changed to a 5Ghz "Great" backhaul...but does not work AT ALL. Devices can connect to it, but have no internet. The 6Ghz ssid is hidden, and the wireless page says "This band is used as dedicated backhaul. You can disable Hide SSID to allow devices to connect." I have set ""Backhaul Connection Priority" to 6GHz and "Preferred WiFi Uplink AP" to the other ET8, but this has no effect. Any ideas???