Merc E220 (1995 model) erratic starting problem: My car starts 90% plus of the time, no problem. However, every now and again, mostly after a short trip, with a short break after switching off, it refuses to start. Mostly there's nothing when you turn the ignition, but sometimes there's an electrical whirring sound, and yet other times the motor swings but the car fails to start. Then, when you leave it for (say) an hour or longer, it starts perfectly again! Therefore, it is clear that this is not a battery problem. The problem is difficult to fix, because every time it goes to the dealer workshop, they can't imitate the symptom. They have now replaced a relay, and the starter motor, but the problem is still there. Can anybody help, please.