Well that is a horse of a different color..You are correct. If that sort of thing is going on, then the ACC is most likely at fault. It was not really clear from what you described before that was the way the criter was behaving. It sounds like the buttons are not releasing properly and your modes are getting scrambled.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.