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Certainly not normal. I know I've read somewhere about a problem where the Sony AF has damaged the mechanism of certain lenses but can't remember where or if it was only certain lenses involved - I'll have another look around later if a Sony user does'nt respond with the information. If both lenses have developed the problem it seems likely the camera is in some way involved. Lens malfunction to this degree is'nt as common as your experience seems to indicate. Might be worth getting all the facts and dates written down and contacting your local CAB or Trading Standards.
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