X20 x 3. App on Samsung 22 ultra.  PC's are HP, Win 11 Home, connected wired and aireless.  Network is WiFi 6 dual band.  Hidden network on Deco is much stronger that SSID signal.  It will assume the SSID name but not the password.  This causes some devices to not login, like my TV, or lost connections because the hidden network stops, goes off line.  I believe it also causes problems when streaming such as audio sync, audio noise, or saying channel not available.  This started a month or two ago.  Before that I never saw a hidden network on Windows available networks.  The MAC address of the hidden network is 42:84:6a:8f:7c:xx (like 13).  The hidden network uses the same channel as the SSID network on the 2.4G and 5G bands.  Firmware is up to date.  ISP supplies a Comtrend router which is the connection between the ISP fiber and the wired connection to the Deco.  Have restarted both the Comtrend and Deco.  Even rebooted all three Decos.