JCRO We see that your UPC TV Box is connected via LAN. So on LAN 2 we see Powerline boosters and other connected devices. On LAN 1 we see the Sonos and the Philipps. What is connected to LAN 3 and LAN 4?
If your UPC TV box is connected via WIFI, connect it once directly via LAN from the modem, without powerlines in between.

Greetings
Daniele