But if they say it's normal, why would you be concerned, have them put it in an e-mail. Done then you could sleep. hehe but really get the e-mail thats the only proof you may have. Like the 24-70 issue Nikon blames the frozen lens syndrome on dropping, buddy had enough witnesses , and a store behind him Nikon receded the drop scenario. Just keep some communication on the subject from the party involved.