Static in Pot
The volume control in the MF X can V2 is relatively cheap but by no means as cheap as a Radio shack carbon deposited type that literally costs just pennies to build. The unit in the MF is a sealed conductive plastic unit similar to the Clarostat that costs about 12.00 though this is cheap as compared to a precision resister loaded pot it is worlds ahead of a really cheap pot.
Do not spray tuner cleaner into this pot. I have looked at it carefully and even if you could do it you would'nt want to because it is lubricated with a conductive agent. If you still have doubts I suggest you call Musical Fidelity in the UK at (44) 208-900-2866 As I have stated before in this thread they told me it was a cold solder joint and It was. It's also very easy to do, but give MF a call and get to the bottom of this problem your self.
Engineering is making something people want with things you can get.