He's is going into puberty and, same as young boys and girls, is a moody pain in the neck about it
It will pass but you will have to be very vigilant about your spending time with him because this is the time when people 'lose' their bond with their birds.
Yes, birds out of their familiar territory (outside, running errands, visiting strangers homes, etc) are usually very quiet because, basically, they are worried about predators so, if I were you, I would try not to stress him out so much because, like I said, this is a difficult period for him.