@PedroCavaleiro I do not believe the P9 prioritizes WiFi over PLC. The P9 will attempt to simultaneously use PLC and the two wifi bands. If you see it switching, it probably means that all media are...

@MartinX Did you try the other Ethernet port on the main P9? Do you have the same issue if you promote another P9 as Main Deco?

@Portway The Deco X10 should be compatible with your existing Deco mesh. It is generally recommended to use the most recent Deco as main Deco, but you might decide to install the X10 where you...

@Nick105 Are you trying to forward an inbound (coming from Internet) TCP or UDP session received by the Deco on port 500 to several devices? This is not possible. One session can only be forwarded to...

@todi Could you describe your configuration, including your ISP modem?

@Sandbox What is the color of the deco led when the problem arises? Does the Deco publish its "final" wifi name at that stage?