Decided to see what track mode is like. Essentially have always driven in sport mode. Today went for a spin in track. Soon noted noise when shifting. A thud when shifting gears. Even my wife noticed it and asked me what I was doing. Also a soft but definite high pitched whine from the rear end. Then the LCD. Screen started to flicker. Very distracting. Switched back to sport and it all went away. Anyone have ideas? Will try it again tomorrow to see if it was just some gremlin!