It's hard to know exactly, he's done alot...but he thinks this time it was from hate mail he sent. He's been suspended in the past but now it's added up and will have to basically start anew...
He likely did, he said he's simmered down but has admitted to hate speech and hate mail online, he's been suspended thrice times prior. It must feel shitty basically losing all your 3K titles, online rank and data AND all purchased DLC after that, karma is a harsh thing