I've had a similar problem.
Noticed a horrible grating sound like metal dragging along the floor or a shovel on gravel. Was very intermitent and I couldn't see anything wrong. A week or so later I then heard a clang type noise and sounded like something has flung off and hit something. Still no answer but I'm guessing this could have been a stone stuck somewhere and finally dislodged and hit something on the way out. It's made me quite paranoid driving and would be intersted to know if anyone else has this issue and discovered it to be a possible stone or something else.....
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