When trying to coast to a stop at around 4 mph the car will slam to a stop. does not always do this but it's sometimes very hard to come to a smooth stop as the cars braking system (regenerative braking?) will kick in by itself. can be dangerous if a car is tailing very close to me as it will seem like i'm driving unpredictably. took the car to a dealer but they could not replicate the problem at the time. although the problem is intermittent it is more likely to do this when the car is still warming up.