2003 s 350 wont start????
 

Hi, i have a 2003 S350, I have been using it no problem, but now it wont start? when i put my key in the ignition, the mileage disappears from the dash, the key wont turn, nothing happens. The car wont lock either. Its as if its the wrong key!
I come back to the car a day later and it starts fine for a few hours, i use it as normal but then it happens again?

Any ideas????