Wow. I had the small give on the top of my phone and that went away. Yesterday I picked up my phone, thumb at the bottom (speakers) and fingers at the top (headphone jack) and the entire top fo the phone clicked and gave in a bit. I love my phone but man, between this and the battery issues and the heat on the back, this sorta sucks.
Now the entire top plastic part of the phone clicks and gives if I press on it. You can actually see it moving when I press on it. Granted, I will try not to pick it up like that anymore. Hopefully I will just forget about it.