hi I recently bought a 2008 xf luxury and the sat nav doesn't seem to be working, once you have agreed to using the sat nav the screen just says DVD check in process and stays like that,i have removed the DVD and inserted again and I have also bought the latest 2018 maps DVD off ebay and same happens with both, it accepts and ejects discs fine and when sticking my head in the boot can hear the unit working but just stays on DVD check in process anyone else had this problem or can give me any advice what to do would be appreciated!!!!