Check the tuner input mode it has (air, cable,hrc,irc) with new stations updating to HDTV the demodulation at the tv sometimes looses the color burst sync. I have seen this with more and more tv's with pip tuners , it resets to the default of air ( rabbit ears ) at 75ohms and the low band snow, when you go to the high band (56+) it finds the color sync and resets the vestigial sideband offset, it happens more often if the SAP or CC is also trying to aquire the proper offset. good luck.
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