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Fair enough. I've not seen that but I've not crashed mine hard enough yet. (I mean, I have but I've crashed it so hard there's no recovery mode gonna save it :D)
Mine did similar to sweedee's because I'd installed in a rush and it slipped its position on the hanger lip and so changed through the whole block once and then stopped moving. Once I removed it and reinstalled it (getting the B screw etc right this time) it was fine.
There's sometimes enough friction between the two parts for symptoms similar to what's described.
Anyway, we're mostly looking to properly rule it out before sending it back.