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New digital cable receiver did not fix constant pixelation.

My house currently has 4 televisions hooked up to comcast cable. Of these 4, 2 of them use cable boxes for digital cable. The problem is that the I get constant pixelation(tiling) for one of the TVs connected to digital cable. At any given time, a group of channels is pretty much unwatchable from tiling, audio dropping, or just giving me a "Channel Not Available" screen.

I've contacted Comcast, and they recently replaced my cable box with a new one that looks to be a MUCH older model(Just a small black box with no buttons and doesn't catch the remote signal well at all). Not only is the "new" box less functional, but it also did NOT fix the tiling problem. I'm not sure what's causing this, but I'm tired of paying for a service that isn't satisfactory.
 
sad I’m frustrated
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