I also think that with the team's offensive struggles, he has been trying to pull the ball more likely in an attempt to hit HRs to get instant offense for the team. He has also expanded his strike zone earlier in counts swinging at first pitch breaking balls which is something he normally doesn't do. Again, this likely goes back to trying to do too much. As Fielder Jones pointed out, I'm sure the cold weather doesn't help either.
The very existence of flamethrowers proves that some time, somewhere, someone said to themselves, "You know, I want to set those people over there on fire, but I'm just not close enough to get the job done." -George Carlin