One frequent target of Cueball-orgnaised bashing are the local TV stations. They regularly take a pizzling from callers for pixellated, distorted, or other picture problems.
The broadcast regulator, ACMA, routinely finds that this problem is caused by cheap, poorly shielded LED lamps purchased from China.
As there are no standards (yet) for LED light radio frequency (RF) interference, many of the bulbs are causing huge amounts of interference that results in picture collapse.
It is generally only one or two channels that are affected, not all of them. And if you live in a unit block as we do, it can be cheap LED lights in an adjacent apartment, if they are located near the TV wire.
Read and learn!