I had the exact same issue last year on my Mercedes C Class, but the Conti technical guy visited me at home and said it was due to under use and they had gone hard and the compound had dried out ,
They offered me as they was half worn a new set for half price when I said will the same happen again and he said quite possibly. So I sold them on ebay and purchased a set of Michelin Pilot sports .Im hardly going to use the car extra to reduce the risk of it happening again.
I will have a look later and see if I still have the pics and post them up.
I wont ever buy Continental through choice they were OEM on my Merc
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