zee derailleur clutch fail

Had a new zee rear fitted just a few weeks ago. Very impressive bit of kit, riding this weekend though and noticed a bit of chain rattle, so stopped and found that the clutch part has failed. I know its a warranty claim etc, but has anyone had any similar fails or know of anything I could perhps be looking out for on it which I might be able to put it right. No signs of any damage on derailleur so I don't believe its taken any type of impact.
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If all else fails, you'll probably see if there's something broken.
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bike shop said same, although I mailed Shimano tech and they said doing that will void warranty. Im tempted to give it a go though cos of the FAFF if I take I back to LBS. they have offered to fit me a new one an then send other one back to see if Shimno consider it to be a genuine warranty claim.
Thanks for help on this b the way.