Carlsen doesn't play as well now as he did a couple of years ago. He used to play the best moves instinctively, and without thinking too much. He looks more labored now, and doesn't seem to be in great form.
He doesn't seem confident he can win games, and looks to prefer to enter into "boring" positions with a high probability of remis.
Looks like he's just trying to get through the 12 games to get to the rapid chess. He's much better at rapid than Caruana, but I'm not sure it will go as far as the rapids. I think Caruana will win one of the next games, without Carlsen managing to fight back.