I have a problem with the original GPS unit in my X5. Most of the time the system will freeze after a few minutes driving. The radio is still working and can operated via the left hand knob and the steering wheel buttons, however any info displayed on the screen freezes and it becomes impossible to use the right hand knob. The info (like fuel consumption) still gets updated on the cluster. After some time the system will usually reboot, and may do so a few times before the screen just becomes permanently black (still powered on though). Sometimes when I start up the car the screen will start in a mode with simplified graphics (like black and blue color only).Has anyone had the same problem? Does anyone know how to fix this?Don't know if it has anything to do with it, but the CD changer has been bypassed with a iPod adaptor. However this problem has just recently appeared while the bypass was done some time back.