DB to the rescue!
Very common issue as DB has suggested. A thread will help out many who discover this problem. As a mate who owns a prominent music store told me, a customer brought his Epi in, some 6 weeks old, swore blind to him that the headstock just flew off the neck all by itself. It was there in the music room up against the wall all the time, no one had touched it...he wanted a full refund.
That was until the little voice of his daughter standing beside him fessed up "Daddy, I'm sorry, but I knocked your guitar over by mistake...."