Same thing here. Always played fine until yesterday...
Went trough all the steps, with the re-installing, the checking and re-checking the files in the 'Saves' folder, etc.
At one point I could just reboot and play with no problems. Then, even that went to hell.
It just happened all of a sudden. I didn't install anything, update drivers, nothing different from every other day I played this game.
I'm all out of ideas for this one, and since 2k won't care...what's left to do?
Edit1: I am from Europe, but I doubt that would be an issue.
Edit2: I am also around the 30 game mark with my current season. I had another one with around 60 games played.