What's wrong with A.J. Burnett? Joe Girardi isn't sure, but he confirms that Burnett's spot in the rotation won't be skipped.
Giving up nearly 7 walks per 9 innings is usually a good way to see your ERA climb above 5.00, and that's exactly what Burnett has done in June. If you want to find the silver lining, you can point to two things; first, there's no talk of any kind of injury, and second, Burnett seems to put together an ugly streak like this every season, and still manages to end the year with respectable numbers.
Burnett has always been an all-or-nothing pitcher, but the fact that he still has a job in the majors suggests that he should be able to weather the storm and get back on the right track.