Hello everyone my name is Franco and I come from Malta I drive a mercedes w205 year 2015. Lately I am experiencing a fault with both back air shocks. After a couple of hours the vehicle is switched off it lowers down on the rear only. it will lift again once its restarted. I have tried to lift the car to the second stage and it will not lower down after switching off it works all gd.I went for an advice locally and was told it could be either the airstruts or the valve block on the air pump. kindly is there anyone that had the same experience please