It's been almost two years. I can't believe the problem still persists.
The following list of software applications can cause Forza Horizon 4 to either fail to launch or crash while playing. Please make sure you either disable or uninstall to ensure successful gameplay.
Logitech G Hub
MSI Afterburner / Riva Tuner Statistics Server
Warsaw Banking App
A-Volute Sound studio
Hi mokichi, thanks for answer.
Basis of problem is don't know if it forza or ss3 drivers.
As the problem stems from realtek ss3 drivers. because
Only Logitech G-Hub and realtek SS3 drivers were installed. After a few crashes, I removed the realtek and SS3 drivers. problem solved.
the sad thing is that the problem has not been solved for as long as two years. perhaps due to lack of communication between ss3 and forza developers.