Purchased cars not available? Have to purchase them again?

Since the September update this game has been running really bad.
Frame rate has dropped a lot.

Plus I have purchased the car pass and now I don’t own the cars.
I have to purchase them again?

Really losing my patience.
Now going to play Project Cars 2.

Thanks for nothing Turn10.

Have been with you since Forza 1

Sounds like you dont actually want help

Have you checked that all your dlc is still installed