Thank you for your clarifications again!

Now I understand how the IFZ, CAN BUS and HFM Module works and you know what is happening with my car. (most likely the cause)

I have been doing a lot of homework and researched many forums that could lead to why my car is behaving like this and the similat symptoms happening to other Mercedes models . Do you think other factors such as:

1. Over Voltage Protection (OVP) (Happen to a lot of E W210 classes)
2. Crankshaft Sensor
3. Starter Motor Pinion
4. Fuel Pump
5. Alternator

has/ have any relation to these intermittent starting failures? The MB dealer claimed that these 5 items are ok!? But I would like to hear your comments