Is this something that happens when put your X in a case? If so, there's a magnet in the case activating the car dock mode. A magnet to one of the X's corners activates Car Dock and the other corner does Media Mode.
It's possible you might be able to take take the magnet out of the Car Dock itself, if this is the annoyance. I don't have one, so can't speak to how hard that might be. If it is do-able, it would be the easiest fix.