Maybe its Nvidia too. They tend to make older models slowly worse and worse over time, to make sure you dont keep using them, even thought they can handle newer games at lower settings.
But I have no idea how to tell when its them vs an error on SEs part.
(Quite a few times a patch has come out for 14, and an NVidia driver comes out roughly similar in timing. Though I havent checked in a long while as I stopped updating.)