I have the same situation a pcb, The door is never shut on my three, they have their own room and can visit any number of the 22 that live their. Are they getting at least 12 hours of complete covered quit sleep?. Also if mine are a little restless, and this may sound funny I'll put on some Enya, or music of that nature. My Cockatoo loves Kenny G, go fiqure. Maybe they are lacking in a certain vitamin. Good luck and let us know you come up with an clues

here is a picture of their home