F1 2018 No grip at the rear end of the car.

[Wizaard5]

Hello,
I'm playing career mode. It's my first season and im with renault. I've already bought the 2minor aero upgrade and the 2first engine upgrade. But since monaco i got a probleme(im actually at Canada). The rear of the car is very unstable and spon round rly often. I've already tried few setup but nothing change and it's rly annoying.
If someone can help me . Thank you, have a nice day