Question about Mitsubishi WD-65737 65"" rear projection TV"

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Why does my Mitsubishi WD-65737 TV go black for 4 or 5 seconds then picture comes on again with the top left corner says "Cable Box".

Mitsubishi WD-65737 TV turn on, however while watching it on cable input the Mits screen will go black for 4 or 5 seconds, then comes on again with the top left corner says "Cable Box". Repeats that problem every 30 seconds or so the same way. Driving me nuts. Does anyone know or this problem?

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Replace service cords, as they might be getting worn and loose. It does sound like that to me. Bad coaxial cables

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