If there was ever a time for a change it's now - his old team got him to the title, but they haven't been able to re-capture the magic that made him so menacing and confident, he's just far less confident in his approach and ability to control a fight.
Maybe it's just one of those "spiraling bad-luck" situations where it ruins your mindset - DQ out of the title with only himself to truly blame, loses a debatable split to the same guy whose game plan is incredibly difficult to deal with (lots of moving away and holding from grappling positions), gets robbed against O'Malley to give him the springboard to the title, and then for the first time in pretty much his entire career just gets run through by Merab using endless chain-grappling to gas him before he could get in a rhythm.
He doesn't seem physically any worse for the wear, just kind of hesitant and less confident in his approach. He's never been dropped (stunned/hurt but always recovered quick), he's never been subbed, incredibly well-rounded fighter with a mean-streak and ability to blend and chain positions and techniques.
It's gotta be a "head"-thing, so I'm hoping this can rejuvenate him. Watching his UFC run to the title and the Aljo fight (despite the DQ still a beautiful fight from him, building and vicious with so many dope counter-grappling trips/sweeps/throws and creative ways to hurt someone), and the Sandhagen fight were all a joy in technical violence.