My 3 year old son reciently has been doing strange facial grimmaces and arm contractions. He does these at the same time. They only last 3 secs at most. He is fully aware when he does this. We can talk to him he can talk back to us and he can stop it. He does them at least 3 times a day or more. He does them with out any sort of trigger. Does anyone have any idea what this is? Thank you