Tiling, TV Screen is tiling

I'm writing this because it wont let me answer a question in the TV Forum about this subject.  Usually when tiling occurs, it is the splitter you are using in your home.  Over time they wear out / short out, which causes the tiling.  I am helping my GPA in vegas, and the cable guy also said that the cable, originally installed when his condo was built, is old and needs to be replaced.  The cable guy also told me that COX is not willing to replace that cable through the walls, they are only willing to run new cable on the outside of the building, which is against HOA rules and regulations.  Basically, somehow we have to run our own cable out to COX's cable box on our own????  Very interesting.