I agree that he has a self discipline problem. He's a fat, aggressive player but whatever his discipline problem is , I've seen plenty of evidence of it this season. Maybe he's always taken himself in hand. His yellows that I've seen have been for reckless, over-the-top challenges. The only exception that I've seen was in the Brentford game when that Hunt bloke spent the match out playing. The kissing of the QPR badge in front of the Bees fans incident was the final straw, and he lost it. He should have gone for it.
I trust the referee next Saturday will be briefed about the just treatment he's likely to receive, and will laugh and take no action. (Said more in hope than expectation, going by the referees in this division.)