Does Kei-kun have a friend/friends around his age who come to your house or who play at friend's house on regular basis ? He may be experiencing a boredom. He might be the age needing to start spending a little more time with friends and other adults other than family members so that he can lean how to communicate, share and cooperate with others. Are there any group activities Kei-kun can participate in your area.? His focus might shift from getting an attention to having fun playing with other kids.