Yep mine did it too. If you hunt, there's a 5 second video on youtube of a guy displaying this as well. Something's wrong, as my 3.6r loaner didn't make the clicking sounds. Smooth and Silent. The 2.5's hatch almost sounds like a ratchet is engaging to keep it from falling in the event of an emergency.
IDK. Have the dealer take a look, but I don't know what the cause of it is.
Sorry I couldn't be of more help.
It's not normal and is well documented in another older thread somewhere on here. I had mine replaced under warranty so if you still have warranty I would suggest you take it in. If you're out of warranty I don't think it's fatal. Just annoying.