Okay, that's it, Comcast...

[Shepherd]

I used to have similar problems with my cable television. They replaced my cable box about a half dozen times, despite me telling them repeatedly that it probably wouldn't help as none of the previous replacements had helped. They finally sent someone to thoroughly look things over and he figured out that the box was receiving almost no signal because there was something wrong with the wire that they'd strung under the house from the external box to the wall jack.
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV