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Sound fluttering on new Samsung LN22A451 HDTV

We just received and installed our new Samsung LN22A451 white TV in the bedroom on the wall. Service is Comcast, directly into the TV, not thru a set top box. After 2 days, we started get sound distortion, fluttering. We were watching HDTV channel at the time, and it happens on other HDTV channels as well. We returned that new TV and got a second new one, same model. We get sound distortion on that second TV as well. Could this be a Comcast signal problem? Could the problem be that we are not using a set top box on this new TV?
Our other HDTV in the living room, a 32" Toshiba uses Comcast but is thru a set top box. We've had no sound problem with that TV over 2 years. Any thoughts? Thanks, Pete M.

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