Hi, I recently bought a Mercedes C-240 V6 2001. It had no problems untill a few months ago. Whenever i leave it locked at night or for a few hours...it wont open when i try to open it with the key. It seems like it doesnt recieve the signal or something. People say maybe its becuase of the cold... But it doesnt even get too cold here...max (-1 Centigrade).... What could be wrong? Than i go away and try it after 15-20 mins... Than sometimes it works fine. Other times it wont, Most of the time i jerk the car...than try it and it works. So...i dont understand what the problem is :/... I have changed the keys cells, so that is not the problem. i have held the key like 3 cms for the signal reciever on the door it still wont work ...What should i do?