It's the tang of the seatbelt buckle that's causing the paint chips on the grab handles of the doors as one unfastens the belt. I was unbuckling my seatbelt and it accidently hit the handle causing a small chip. Looking closer, I noticed a couple of other parallel chip lines with the same radial arc. Fortunately, I have the sand color interior and the handle material under the paint is a beige color, so the chips are not too noticeable, except now that I know they are there, my eye seems to catch the little buggers. Those with the black interior probably notice it more. Needless to say, I'm being more careful when removing my seatbelt.