I have been using a HMDI splitter on th output of my V6 box for about 6 months. It just stopped working. I tried a new one same model, and a new 'enhanced' one. Still no joy.
I'm suspecting either the tv or V6 box have had firmware upgrades downloaded automatically.
Main tv is a Samsung Q90R, 2nd is a series 7 Samsung. Both UHD but I suspect quite different in the range of inputs they can cope with. I'm suspecting HDCP 2.2 problems.
I'm not buying another Amazon cheap splitter!