@Denis55 Maybe you put your Satellite Deco far away from Main Deco. I also faced this issue with Deco M4 because satellite Deco can't get enough signals to always get online. Try to move it little closer to Main Deco and try.

  @ARGamingPK1 It is connected by cable…everything revolves around the app/firmware I also tested on new Deco x60 system and the same manifests and before I tried all possible and impossible modes on old X20 system including side by side.

  @Denis55 Try new beta version of Deco App 3.8.102 on Android.

  @ARGamingPK1 I installed the beta application and it seems to be fine now it appears online but if I restart the network the secondary unit still appears as offline although physically it is online, probably becouse the firmware is not updated to beta like the application but I am waiting for the final stable version for the firmware.

@Denis55 Bro delete the App Beta firmware and download the stable update from the google play store or apple store which is still better than this Beta 

  @ARGamingPK1 

Before the current Deco Beta app version 3.8.112, I had the stable version 3.8.69 from the Apple Store, where the secondary satellite was often offline in the app. However, I’m sure it’s not just the app, and a firmware update specifically for my X60 V3.20 EU system is also needed.