I'm not sure at what mileage it completely stopped doing it. I figured the transmission maybe needed a little bit of breaking in which seemed to be the case. I was also going to change out the transmission fluid if it didn't get any better. I never even considered taking it in and leaving it at the dealer to be honest, I've had too many bad experiences and there's no way I'd leave my car overnight.I just don’t understand how people just ignore this? It drives me completely insane and isn’t something a brand new car should be doing. It should not lock you out of a gear for 8k at least and then just fix itself.