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try jiggling the channel selector and see if that solves it.
If this uses a varactor (pushbutton tuning with presets) then the varactor presets may need a deoxit bath.
sounds as though its just falling out of tune, but.....
You should also check the brightness, picture/contrast, and panabrite/panacolor switches. If they are dirty the symptom can occur as well.
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Jordan
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