Last December I went to the service center because every time I went over any sort of bump there would be a rattling noise. The first time they claim it was a misaligned subframe and it wasn't fixed. The second time they said it was the front stabilizer bar and claimed to fix it but wasn't. The car is in service again and this time they said they did everything they could and it wasn't a problem and that it is normal for E350 with 4matic which I think is bs because so far I've owned 2 other mercedes with 4matic (ml350) and driven c240, c280, and 5 c300 4matic loaner cars: and that noise started occurring almost a year after I leased the car. So my question is:Anyone else have this problem? Is this car a lemon? And any suggestions??? Thanks a lot