Help: At first the device did not recognize the Navi-CD a few weeks ago, after some attempts it was possible at some point. A few days later he always reported that the CD was not readable and that the device had to be cleaned. A few days later my wife called me in the office and let me know that she could not turn off the radio any more. In the afternoon then the radio is off, but can not be switched on. Did the battery disconnected and jammed; radio remained on I drive to the Bosch service, the technician gets into the car and turns on the radio: it’s running. This morning my wife is on the road with the car and then reports that the radio turns on and off at ground waves. Trying out results: Radio stays out. The device reacts to no key commands. Also the error messages of the on-board computer (brake light test, cooling water level, brake lining) cannot be pushed away. Who can help me; what could it be? Did someone have the same error? The fuses are all fine by the way. Today, after an on/off button and the central control button above were illuminated.