Go ahead and do a search for older KJ posts.
In just about every post I do analyzing him, you'll see me refer to him being a "streaky" player. He had a small slumpish thing to start off the year, then a ridiculous hot streak, and now a prolonged cold streak.
If you own KJ for any period of time, this is what it's going to be like. You can either sub him out when he's going cold (I mean, if ever you were going to bench him and wait for signs of life, now would probably be the best time) or you can just ride it out, having faith that he could get very hot again at any moment. My personal preference is the latter, but maybe I'm just lazy with my daily transactions.