I seem to have to clip Sasha every once in a while.. Sasha gets a huge attitude problem, I try and resolve it but he gets mad, biting, wrecking things. I then clip him and immediately (like within 5 minutes of being clipped) he turns into the a perfect angel and stays that way. I will then let his feathers come in again to be fully flighted and he is fine for a couple months, but then his attitude returns.. So I just repeat the process. I guess when he is clipped he knows he is dependent on me, but I am guessing when he is fully flighted he think he is independent and can do what he wants.
However, after each cycle it does seem like it takes longer and longer for his bad attitude to return.. first time I had to clip him after 3 months fully flighted, 2nd time after 5 months. Right now he is fully flighted but I see his attitude returning and probably going to clip him again, this third cycle he has been fully flighted for about 6 months. He is still young so hoping maybe he will be better as he ages.
I have tried all sort of discipline trying to get him to stop. I tried ignoring his behavior (has negative effect), distraction (does nothing), engagement(usually end up being bit), being stern(works a bit but only temporarily).. The only thing that is even somewhat effective is time outs in his cage.. He whistles and whistles wanting to get out, I just ignore them, then after 20-30 minutes ill let him out, and then seems to be a bit more behaved for rest of the evening, but next day back to his old self.