Thats not good! Mine did the same thing. They had to replace a faulty valve unit and both front air springs. The dealer told me when the front end bottoms out like that air springs get damaged and need to be replaced. This is what my invoice said. 19131 interogate falt memory.I dont want to scare you but they had my X for a month trying to figure out what was wrong and the valve unit was one of the last things they replaced. Tell them to check that vavle first!!! Mine was under warranty. I hope this helps.