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I have a 4 year old Panasonic 50" plasma HDTV can't remember the model - has only one HDMI port on back). Every 2-3 hours the entire screen video will change to a very fine snow for about 3-5 second, followed by a black screen for 3-5 seconds then the picture resumes without problem. The audio continues with no interruption. I think it only happens on HD channels, but it will also happen with DVDs. I can offer more info to any responder as requested. Thanks for your help.
 

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HDMI handshake / copy protection error, or hdmi port is going bad. Hard reboot (pull the power cord) all the source devices and Tv. Re-seat all the hdmi cables, maybe try a new one. Get firmware updates on all equipment. Last resort replace the board that has the hdmi input on it.
 
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