He was pretty bad about the whole month of August, it seemed. The two months before that, though, he was as good as ever. Maybe those innings caught up to him a little bit... could be that the groin has been bothering him a little more than he's let on, too.
EDIT: He wasn't quite as bad as I thought in August, it's really just been his last 3 starts.
8/31 vs SF: 5ip, 6h, 7er, 3bb, 2k (L)
9/6 @ NYM: 6ip, 8h, 3er, 2bb, 5K (L)
9/11 vs CHC: 2ip, 6h, 6er, 2bb, 2k (L, most likely)
The two games before that he pitched 8ip in each, allowing just 1 run total...