Your complaint about Z4’s behavior has come to us as a surprise. We’ve never had any problems with this specific model before. Z4 is highly intelligent and sensible. Your robot may be acting negatively to draw attention to himself. He might feel neglected. Z4 doesn’t accept being treated like a machine and doesn’t like to be reprimanded. May I suggest that you try and discuss your relationship with him and build his self-esteem? Failing that, we would be happy to send one of our psychologists to talk to Z4 tot solve the problem.