I am engaged in a year-long struggle with my self-leveling rear suspension. The vehicle is equipped just with self-leveling rear suspension, lacking Airmatic suspension at both the front and rear. For many months, the automobile suspension would lower overnight, sometimes affecting both sides, other times just one side, and sometimes remaining stable for weeks without any drop. Recently, the situation has deteriorated, with frequent nightly drops occurring, affecting either one side or both sides intermittently. Due to the inconsistency, I did not believe the bags could be leaking, as I assumed that if they were, the leakage would be constant. I decisively replaced the control valve behind the rear bumper with an authentic MB component. The defect persisted. I purchased aftermarket bags, changed them, and resolved the issue. The mechanic conducted a leak test on the old bags, confirming they were indeed leaking. The automobile has functioned properly for almost one month. However, last week, during a cold snap, I received a malfunction indicator. I saw no more symptoms. The fault indicator had reset upon my subsequent ignition of the vehicle. However, this evening, during another cold snap, when I exited the roundabout and merged into the motorway slip lane, the vehicle began to bounce pretty violently. It was so severe that I had to decrease my speed to 40 mph and activate my hazard warning lights. Shortly after the bouncing started, the malfunction indicator illuminated (image of a vehicle with a downward arrow). The bouncing persisted for around 2 miles, and when exiting the freeway, while halted at the roundabout, the dashboard displayed the message “Wait – Vehicle rising.” This resolved after around 30 seconds, following which the vehicle functioned normally. Upon restarting the engine, the problem indicator had vanished. Could someone assist me with this, please?