What's wrong with Stafford's Arm?

Is it an injury? Fatigue? First half of the season he was dropping dimes on long passes. But for several weeks now his deep throws are always under thrown and result in a number of his picks. In this game alone - Skowronek was behind the defense, as was O'dell - both those throws could have been touchdowns. I don't think it's a misguiding thing - I think he just can't throw it that far now for whatever reason.