This may help a little, or probably more likely, may not be worth a fig (
) but have you seen DickB's originating post in the thread I've linked below?? Particularly the image it contains, which comes from the glovebox manual & refers to shifting...
https://www.spyderlovers.com/forums/...se%3B+%2Bshift
Like I said above - it might help, more likely not
but it's probably better to know about this & maybe consider any ramifications it
might have, rather than continuing to struggle with searching for a helpful diagnosis, unaware that your problem
juuust might be related to something as simple as the speed/duration of your flick on the flappy paddle/gear selector...