Car noise on 2010 Toyota Camry

I purchased a 2010 Toyota Camry in Dec, 2009, and drove that car since then. Recently, I notice if the car sits there for a while (over 4 hours), when I start the car to back up a little bit, then drive forward. There will be a clinck noise came out. I talked to dealer about this issue. They said it is normal, but I really doubt it. Can anyone help me about this? Thanks in advance.

2 answers
See another dealer, if possible, and if that does not satisfy, then call Toyota customer service. There should not be any clunks on a car this new.
I have the same issue, and it's the ABS system "clicking into gear"