2015 Q50 130k miles. This morning after the car had been driving for over an hour, decelerating has been awkward. When I come to a stop, it is almost like coming to 2 stops. I slow down to almost a stop, then it jerks, almost like I get lightly rear ended then the car stops. Transmission light came on. Anyone else experience similar behavior or can help in a little troubleshooting before spending a ton of money here? Thanks in advance.