Hi All. My 2010 Discovery4 hse has developed this fault for no reason has anyone any ideas. When entering the vehicle the OBD lights up and within seconds a temperature error warning comes on the screen and almost immediately turns off. So no radio or sat nav. Sometimes very rarely it will come on and stay on for a while but no reverse camera. Checked all fuses, battery and inspected wiring with no faults on camera or anything else found.