You might note, one of the products made by TI is a chip that filters noise and spikes on the incoming HDMI. It only works if you use it.
I have had terrible issues with HDMI switching stability. I get a lot of "HDMI has issues" answers. Well, what I see is poor implementations by great amp companies who are not experienced in digital interfaces. I guess a law suit is easier than hiring some engineers who understand this.
I spent 10 years in failure analysis. I have a pretty good understanding on issues relating to interfaces. Anyone who expects a twisted pair to be clean is naive or just plain an idiot. I am NOT defending the cable box manufactures, but ALL of industry owns this problem and they need to work together to solve it, not just the HDCP protection that made HDMI happen. The HDMI working group is to blame.
If I were to design a product like this, it would have an optical isolater on the ports. I have never seen a ground loop jump one. This is why I use fiber for PCM over the coax.
Digital is not easy. It is not just on and off. Actually, digital is a concept as in the real world, it is still implemented in an analog world with a touch of quantum complexity tossed in. I did a survey of several years history on all the failures ou company had had. Over 90% were a component connected to the outside world in one way or another. These are design issues.