Rear Suspension Springs problems of the 2005 Mercedes Benz E500

Rear end goes down when the car in parked. "stop" message (red) appears on dashboard. Do not drive car and take to mechanic immediately. When I start car after 15 to 20 min message goes away and car again comes to normal position. Its happening almost everyday from last few days. In forum I read it is common issue with e series of 2003, 2004, 2005, 2006. My car only has 120k miles. Learned that there is leak in air springs and it is very expensive to repair. I had same issue 6 years back on front passenger side when I was driving. Front passenger side sat down completely and rim started hitting tire. I was driving on highway at 65k/hrs. I had to call mercedes and they asked me not to drive and they towed the car to dealership. It took 2 days to get car fixed and cost me $2000.