[Dirk]

the next time you go to photo store bring the camera too perhaps it is a camera <> lens problem , nikon lenses arn't cheap so if you bought them in europe they should work in the usa too , consult the seller with the problem and mail or call nikon usa explaining the problem .

i have a 18-70 now since 2007 it has never ever failed me , my 18-55 vr i have since 2008 and also never ever failed me and i do not expect this from nikon.

good luck