Thanks Jay,
My signal strength is fine (in the 80s): The kind of problems you get from a weak signal are big blocks showing up on your screen. That's not what I've been seeing.
The compression artifacts I've been observing are the result of the compression of the signal before it is broadcast. They are smaller grainy blocks and checker board patterns that often show up around high contrast areas, like edge between someones shirt and a suit or skin
To answer your question, "Have you only noticed this over the past week?"
I definitely saw some compression on on DirectTV before - all digital TV has some compression artifacts - BUT in the past week I noticed a significant increase in the amount of artifacts.
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