My macbook charger tip was very hot today when connected to my macbook. and was charging with 7.3 watts. The tip was almost too hot to touch so pulled it off with the wire. I reconnected after tip cooled down and then charge with 12 watts. got hot again so let it cool and tried again now charging with 33.2 watts and tip warm not hot. any ideas guys? genuine charger from my pro 18.5/16.5 85w charger. Charger tip looks ok all pins ok not stuck down.