I am not going to disagree. There have been pathetic performances after his good summer, but I always felt his success then came as a surprise to him and he still has to learn to digest wins and being a favourite in matches.
Ofcourse that, dealing with pressure. He said so in Orleans he had difficulties with that.
But maybe also getting used to the surface. His favourite surface is by far clay, and he hasn't done too well on others yet. That takes time I guess.