I have just taken delivery of a brand new Volkswagen Amarok with an 8-speed automatic gearbox. On a number of occasions now the vehicle has made a nasty grinding noise when engaging drive (like not using the clutch on a manual). I have also had the grinding noise after engaging drive and as I release the footbrake and the car starts to move forwards - it momentarily starts to stop like the rock you get applying a Land Rover parking brake and then it drives fine after that. I have also had a banging noise when the vehicle changes up and down the gearbox. I have also experienced issues with reverse, having to really rev the engine to get any rearward motion. This is the third Amarok I've had, the others have been faultless. Any ideas please?