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S Video is a 4 conductor circuit. Hot and shield for chroma and hot and shield for Luminance. The Luminance also carries the sync signal. Should the shield connection of the luminance become intermittant, the shield connection will find its way via the shield on the chroma circuit but intermittant shield will cause a jump in impedance when this is the case. This impedance jump due to the shield making and breaking on the luminance side will usually cause the video to appear jumpy. Therefore I agree with Ron's suggestion to try the cable swap. But don't rule out issues with the S Video sockets. This is a much harder remedy, unfortunately.
 
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