I would definitely try Ivylog's suggestion. There is a section that thoroughly describes the Cruise system operation. There is also a section that has a complete troubleshooting process described for the cruise control part of the system.
It also states that if your problem is intermittent, and I will add likely involving multiple functions, the clock spring is a possible culprit. Connectors and connections are more likely to be the cause of such problems, but the clock spring can certainly be a possibility. In your description of your problem, however, I would check everything else that is reasonably easy to do before I would tear into the steering wheel to get at the clock spring.
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Jim & Angie, Boise, ID
2021 Entegra Esteem 27U
2017 GMC Acadia Denali
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