XVT323SV - problem (image tears) on one channel

It seems to me this problem is due to the channel and not the set, but it is odd.

I have basic comcast cable in chattanooga, tn. 2-13? (my primary use is streaming netflix/pandora etc.)

I used to have a 22" LG w/ a qam tuner in it and wanted to bring that shelf down and replace w/ a larger tv closer to eye level in that room. So I chose the XVT323SV. It worked just fine out of the box, and even picked up a few more digital channels than the LG. Namely the biggest surprise channel was 32-5 (espn). I should not get espn, but it was an interesting surprise. Anyway that channel's reception was fine for over a week. Suddenly yesterday morning the channel began displaying pixelation. These pixelations/tears in the image were worse when there was a moving camera/image. This only happens on that channel, and the sound is fine. Now considering I should not really receive this channel I can't really blame it on comcast or the tv, but I am just wondering why the channel is suddenly worse.

I tried unplugging the tv for a bit and restoring settings.
I tried moving it downstairs to see if a different jack made any progress.

Any explanation for the sudden change?

Perhaps this thread should go in another forum.

Thanks for any tips you share.

thanks steve. hopefully it will improve, but at the same rate i do not really pay for that channel. just oddly convenient that the one channel i miss from 'regular' cable came through.

bob, it might be. i searched around and found a pretty good source.

if i visit here

http://www.silicondust.com/support/channels/

and type in my zip then choose comcast cable, then scroll down i can find this;

qam256 32-5 UNKNOWN 480x480i 4:3

(with a picture of espn's standard broadcast screen of upcoming stories etc.)