I love my XF but lately when opening the driver side door the interior lights and the Jaguar symbol on the touch screen do not illuminate. This is a random occurrence but becoming more frequent. When this happens the car will not start - no response when depressing the start button. If I open and shut the car door a number of times the lights come on and all is well. After starting the clock is reset to 1200 and the parking brake warning always illuminates. pulling the parking brake switch and depressing the brake pedal fixes that. The head lights and horn function normally. Any body have any ideas?