I’ve noticed today that my TV is blocking content from my YouView box, which I use to view terrestrial TV. After a few seconds of watching Channel 4 (UK) the screen goes black and the message “this device does not support channels delivered by the internet”. I can still hear the channel underneath. I can see the channel perfectly for a while before this message so I am confident it is not the YouView box. This box is tuned via an aerial, though is also connected to the internet to allow for some catch up functions.  
How can I stop this? I have tried turning off what tracking settings I can find. Why is the TV allowed to block content?
