Is Fedrerer Slipping?

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Federer lost again this time to American tennis player James Blake 4-6 6-7. Last time it was in Wimbeldon against Nadal. He was the symbol of perfection in tennis and that sharp slip in skill isn't making any sense. I am beginning to wonder if he is getting drunk before his matches or the night before becasue in his match with Nadal in Wimbeldon he literally looked drunk. I never seen Federer have any emotional bursts publically before. He did that in the game with Nadal and the game with Blake that just ended about 30 mins ago. What do you think?