That's definitely not the way it is supposed to run, and it sounds like pushbutton control problem to me. But that's a mighty expensive part to replace without being 100% sure. Try posting this in Tech Help to get an answer from a pro tech.
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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
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