From time to time if I just get in my car, stick the key in to try and start it, it will just spin over and over. If I let it sit for about five minutes, turn the key foward so the fuel pump will buzz up, then it will start. Anyone know what that is or is that common? Also my headlight has started to flicker off and on. Is that a sign of a bad bulb? I am new to the benz world and any help would be appreciated.