Returning problem where most Premium channels can not be tuned in.(e.g most HBO, most SHO, other misc like SCI). Does not matter if I choose HD or non-HD channels.)

Returning problem where most Premium channels can not be tuned in. [This uses Tivo with a Cable card.] A similar problem was fixed a couple of months ago, that did not benefit from a re-wire of undisturbed wires & connectors, nor from swapping out cable card, or digital tuner, or the TIVO box, or many, many reboots, or power cycles, or a few Cox resets.) Problem mysteriously went away after an onsite tech contacted advanced support and they did something remotely which had service up within the hour after he left.