I have a similer issue with our 2018 Miramar 35.3. Excellent picture on antenna but fuzzy picture on cable channels. Like others have said, it's likely a loose cable or bad connectors or spliter. I went to wallmart and purchased TV amplifier and hooked it up right where the cable comes into the motorhome. It only cost $11.99 and the cable picture is MUCH better now. One day I guess I will check all of the cable connections but this little amp was a cheap fix.
Burch
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