As I was accelerating while merging onto a highway, at approximately 55-60 mph, it felt as if the car lost all power from the drive train. The power reengaged about a second later, and over the next 5-10 seconds the car lost power/reengaged two more times. No warning lights were triggered on the dash. I've taken the car into dealership and referenced service bulletin number sim12-02-11/NHTSA item number 10040855. Dealer reports that because it cannot replicate the issue and there are no reported fault codes, it appears that there is nothing wrong with my car, therefore it cannot confirm if I'm on most recent software or perform software update to fix error referenced in the service bulletin.

- Los Angeles, CA, USA

The new MINICooper that I leased started to have acceleration problems around 6500 miles. What happens is a hesitation in the acceleration of the MINIfrom a start or at low rpms. For example when you're at a stop and you are trying to cross traffic the hesitation of the acceleration is dangerous in timing the vehicle to cross traffic and when the acceleration catches up the car jumps to high rpms. This is being reported because I took the Cooper into the MINIof Ontario service center and they said there is nothing wrong.

- Redlands, CA, USA