Who lost Brady's clutchness?

[Fencer]

Early in his career, Brady seemed to have established himself as one of the great clutch QBs of all time even when he wasn't yet special the rest of the time. Maybe that was his affinity for the kind of offense played in the 2 minute drill. Maybe it was an ability to perform against tired defenses. Maybe it was luck. Maybe it really was him zoning in under pressure. Maybe it was teammates zoning in. Maybe it was never true, and was based on misinterpretation of what we were seeing.

But in any case, it's surely not true NOW. So what happened? Is it Brady's head? Is it the play calling (Pats' and/or opponents')? Is it Brady's teammates? Or is the whole thing just an illusion?