Poor Caption Reception, but only on channels numbered 25 or above.

Ten year old JVC model AV27720. The captions are pretty garbled on any but low numbered channels on the set. It is like I have a poor signal but this is cable attached. I connected another tv to the same cable end and no problems. I know how to put the TV into service mode via the simutaneous pressing of a couple of buttons. Anything adjustable there that might help with this. TV works great otherwise. Thanks Much

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