The signal will either get scrambled or completely black out when a special visual effect is shown on a channel, or certain types of commercial. I tried changing HD cable box, but that was not the problem.
I have had the same problem with Comcast and Dish Network HDTV receivers (center mode icon comes on then screen blacks out for a couple seconds - happening more often during commercials). As suggested I changed the video resolution in the set up menu of the receiver and did not experience the problem any more.
Try removing 1080i from your list of available video resolutions in the setup screen of the Plasma display. If you are using a HD satellite receiver, check the LEDs on the front and note if the device is slipping into 1080 mode when the probem occurs.
Saying that the problem is with your TV doesn't make any sense since your TV is fed from the cable box. Your TV doesn't know one channel from the next. If it had a problem it would effect all channels. You may not have enough signal to the INPUT of your cable box due to a problem on the pole or at your house or both. Insufficient signal can cause some digital channels to not get decoded properly by the cable box. The lower channels will show noise symptoms such as what you describe but they won't crap out altogether like the digital ones. Have a cable tech come out and measure the signals.
Do you have splitters in line with the cable anywhere? If there's any way to beef up the amount of signal getting to the cable box try it.
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