@David-TP 

Thanks for your reply.

Yesterday evening, I did some tests to confirm and the test were conclusive (unfortunately):

• With the TV on:
  • and connected to the Deco Wifi network (watching Netflix and Prime with the applications installed directly on the TV),
  • or TV connected to the native Wifi signal of the box of the Internet service provider (to try to eliminate if the trouble could come from the Deco Wifi),
  • and even when using the Fire Stick TV (stick connected to the Deco Wifi),

=> After 3 to 5 minutes, the other devices are starting to disconnect.

Then, when the TV is turned off, the impacted devices connect again after 3 to 5 minutes.

The only time there's no disconnection, this is when we watch TV using the TV box from the internet service provider, connected with LAN cable to a Deco satellite.

The devices impacted by the disconnection are:

• Netatmo Presence (Outdoor surveillance camera);
• Netatmo weather station (indoor and outdoor);
• Somfy Home Alarm (alarm system - indoor and outdoor camera and the "Link", the device that connects all Somfy Home Alarm components together and to the network);
• Sensibo Sky (wifi controlers for AC unit);
• Wifi connected smart plugs (to control lights etc.);

All the other clients (smartphones, Galaxy tablets, iPad, Sonos speakers, computers, Switch and Xbox) are not affected.

Our internet service provider is SFR (with a fiber connection).

Thanks. Sincerely.