Since you've swapped everything, it's most likely low-level digital video-signals from Cox dropping in and out. After confirming the tiling, the tech should have installed an inline amplifier to provide any missing oomph.
The digital tiling on my Cox Cable TV signals ENDED on the afternoon of March 19th, and never returned. This is being posted as of the evening of March 30th, 2021, so I hope they never return. My technician was accessible all along and I posted him with updates on when the tiling would occur. I did not hear back from him on what Cox officially did to end the digital tiling, but as I mentioned before, he did state that maintenance did "see noise" on the line on several occasions during the disrupted channels, which occurred from March 4th through March 19th. They just stopped. The only thing I did differently was put in a new Contour 2 box when all of this was happening. That did not help stop the digital tiling, which makes sense because it was happening somewhere outside of my home. I would like to thank Cox Cable for helping resolve this exasperating issue, as I value my beautiful TV signal. Two weeks of crappy tiling is enough for now.
