My satnav part was playing up and started to constantly restart itself.. to the point when I start the car, it just shows a black screen and the radio comes on in the background. I have reset it and updated the maps version and have been charged for this.. I have inserted the memory card back in the built in satnav and its still not doing anything and is still restarting... I have deleted everything off the memory card and reinstalled everything and it states successfully completed but when I have put it back in the slot in the car and started engine, it is still a black screen with a loading picture.. the radio still works but I have to guess the station when changing this. I will be grateful if anyone could help me.. it is really annoying as I am relying on the satnav on my phone and this is very annoying. Thanks in advance.