He's just out of form and frustrated. The moment that stood out for me today was when the ball was played through to him in the middle, he took a bad touch and it bounced up off his knee and out of play. Before the new year he would have controlled that and rifled it into the bottom corner with his left foot. He'll get it back and the smiles will return but for now i'd rather have a striker who is pissed off and frustrated that he's playing shit than one who plays shit and doesn't give a crap.