E46 M3 question

[danr55]

Hi guys.

A mate of mine's missus has recently got an E46 m3, and he sent me this message:

Its making a funny noise when you switch the car off, like a rattle underneath, very similar to the kind of noise you get if you nearly stall the car but then suddenly catch the clutch in time. If you have the clutch pressed down when switching off it doesnt make the noise. Im sure i remember soming about this to do with the clutch release bearing? She's popped it back to the garage and they have told her its a common problem and not to worry about it, the other 2 m3's they had in also did it. It's, 51 plate with 78k miles and full bmw history. Thanks very much. If your on the spot with it in gear and pull the clutch up and down quite quickly so it drives forward slowly albeit jerky, it makes the same kind of rattle from around the middle of the car underneath. Difficult to describe but hope that makes sense.

Any of you guys who have had m3's previously got any thoughts on this?

Thanks in advance