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It could be a dirty chromatic/color sentry switch or the preset controls could be dirty. The preset controls should be on the back of the active controls and they are usually adjustable through a hole in the shaft. A good cleaning with Deoxit should take care of it.
There could also be loose module contacts. This was a common problem on these sets. Pull the Chroma module and resolder all the terminals where it plugs into the chassis. Clean the contacts on both the module and the chassis with Deoxit and an old toothbrush. Reinsert the module, making sure it's seated correctly and that the little plastic clips are holding it in place.
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