The drivetrain in mine doesn't like anything much below 2000rpm either - shunt, vibration, etc. - so I try to avoid it. Means using 1st gear more than usual but the box is really nice so less of an issue than on most cars.
I've had a few rattles and clonks. Mainly sorted by the dealer but still a few noises that I would rather do without! I also have a slight rattle from the front at idle - this sounds to me like it could be the cush drive but I'm probably wrong.
Probably best - if you can - to trot to your dealer and get them to take a look / listen just in case.
