I've neither experienced nor heard of this problem. Hopefully it was an assembly oversight and you've corrected it. However it might be worth visiting your lbs and comparing another DA 10-speed front derailleur with yours to ensure all's OK. Normally Dura Ace and Record stuff is trouble free, but, while as I said I'm not aware of a front derailleur malady as you've described, there are other rare malfunctions. If it repeats I'd consider it a warranty issue. Good luck!