I picked up my glc300 three weeks ago. On a seven hour drive to Melbourne I turned into the next lane and a dreadful screaming and juddering started. It sounded like a pile of cans under the car. No warning lights showed up on the dashboard. We pulled out of the traffic and couldn’t see anything obviously amid. When we tried to pull out it started again. It was terrifying. We limped to a lay by and called road assistance who towed the car away. Today they claim there’s not a thing wrong with it. Has anyone else had this happen?