If you don't mind starting from default settings, you might as well try resetting everything to factory settings. Just make sure you note the important settings you want back later on.
Also, Start/Stop is deactivated when you are in Race suspension and Sport transmission. I think both of those being "on" will prevent it from operating as that's what I finally figured out to disable Start/Stop for me every day. I have it set to be in Race all the time and, every time I shift out of Park, I automatically double tap the shifter back to put it in Sport. Start/Stop has not activated since. That might be due only to Sport mode but I don't think about it anymore. It's off and that's fine by me.
So check that next time you're out. If you're in Sport, put the car into D instead.
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