Hi. Regarding charging initialization, subjectively about up to 1 minute for type 2/3, or 2 minute for type 4 to start charge is longest I ever remember. I would try at a few different chargers to see if it is the car or just that particular charger especially with the same mode (2, 3 or 4). Also push the connector in all the way and give a visual inspection of the pins/holes. You possibly know all this already though. Be interested know the fault Mercedes find or if there is a fault in charger at that location. I have no problems at the moment, same as MikeP and Parkwood have reported earlierHas anyone has issues with the charging connector?