Only just seen your post. Sorry if you know this but you're not supposed to drive an X on a firm, dry surface in anything other than AUTO. It could be that you are selecting 4x4 High when you really shouldn't be. One more time, only use 4x4 High or Low when driving on loose gravel (and I mean LOOSE) or when driving off road in mud etc, or when you are driving on snow covered roads or ice. Don't be tempted to go from AUTO when driving in the wet. You will damage the transmission/axle/differential train by doing this. It's all in the user handbook that (maybe) came with the car.
Hope this helps.
Jon