I have had this blue front for a year. He has bee good. We went on vacation for 2 weeks and senthis to our sons in his cage. We got him back this week and yesterday he was missing some feather on a spot on his head above his beek. Today the spot is larger and all of blue is about gone? His cage is clean. I do not think he is eating as he did befor our vacation. He dose not seen to like the people food he ate befor and is not eating his food as well either. The stress of the move? Thanks for any advise