I have had my ml320 for 3 years with not much trouble. After a trip to Iowa I noticed a loud pop when I hit a bump in the road or turn a sharp corner. It doesnt happen all the time. Usually at lower speed as in 1-20 mph. The noise comes from a veriety of places ie. sunroof, rear driver side door, back hatch etc. It seems almost like metal stressing. I hope someone out there has heard of this and knows what can be done about it. The dealer has no clue.