He did, but he still had issues after that. I think for a small stretch there after swapping we saw some signs of it being fixed but then it reared its head again in the Auburn, Georgia, and Michigan games again.
I think it has to be a mental thing, when the moment is big, Seth struggles to use the proper snapping technique or he's being lazy with his delivery entirely.
I've never seen a center with so many snap issues because they're usually the ones that get cut or forced out...snapping the ball is not that hard. Especially in shotgun. Now if it had been an issue of him blocking after snapping that's one thing, but just getting it to the QB shouldn't be a problem.