It hasn't really been since then though. That outing was 7/24 vs OAK. In his next four outings (7/26 vs SEA, 7/31 vs BAL, 8/1 vs CWS, and 8/5 vs BOS) he threw the ball as good as ever, giving up just one infield hit. All of those those runs (and it's 4, not 6) have been in his last three outings, where he was definitely bad in each.
What concerned me today was that after the HR to Branyon, he didn't even feel comfortable throwing his cutter in to the lefties. He threw every single pitch from that point forward away. It's likely just a rough patch ... he goes through a couple bad weeks every single year, but it's certainly worth keeping an eye on going forward.