@RaulH 

Hi, the living Room Deco is one of the satellite Deco X50s, right?

Is the TV decoder connected to satellite X50 via WiFi or Ethernet cable?

The issue you mentioned here" For some reason, as time goes by there starts to be cuts in the channels to the point that the channels can not be seen", do you mean some TV channels are invisible, and could not be found? 

--If yes, would there be any error message?

Here are some common troubleshooting suggestions for your reference:

1. Turn off fast roaming/beamforming on the Deco APP.

2. Temporarily turn off both satellite X50s and leave the main X50 only to see whether the same issue still happened.(Or if possible, please wire the TV decoder via Ethernet cable to the Deco nearby.)

By the way, could you please leave me a private message with your TP-Link email ID for Deco X50?

Thank you very much.

Best regards.