Yes, sounds like the honeymoon period is over and he is starting to settle in and change his ways. That is normal. You can't force a bird to accept everyone. It needs to be their choice who they desire and want to interact with, and who they choose to ignore. I have 6 birds, my cockatiel I got, haes me and loves my daughter, his choice, nothing I do changes that, so I accept it, clean and feed him, talk to him while my hands are hidden, otherwise he growls at me, and accept it. My greys change who their favorite one is periodically, we accept it, and go with the flow,. It makes a much more secure and happier bird.