Yesterday i drove the Indy 500 indurance race and won by some margin, but when I was going to drive it again to gain some xp, suddently it was a lot harder and I really couldn't win. As I can see it my car is slower around the corners, and I have even spent 1.000.000 on maintenance, and it didn't help. How come my car is suddently worse at going round corners, or how come the AI opposition is better?