Vibration feeling at around 1500rpm

[BigshotMD]

So I've owned the 1er for just over 7 months now. Something has developed in the last month or so. I was hoping it'd just go away by itself.

When I drive, full auto (D) mode, when the car reaches around 1500-1600rpm, a vibration feeling/shutter comes about then disappears as the rpm rises. It may sound really stupid, but I bought the car so that it would match it's German characteristic of a solid drive, even low rpms. The vibration feeling/shutter feels like it originating from the exhaust region.

Anyone else have this problem? What may be the cause? Would it be worth getting it checked out?

Cheers.