Hai,
I think the 6.8.9 kernel is the problem. My games are crashing after this update aswell.
https://gitlab.freedesktop.org/drm/amd/-/issues/3343 addresses this issue.
There is a fix, but don’t know when it’s available for us.
https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-6.8/drm-amdgpu-fix-doorbell-regression.patch
A workaround for me is booting into a previous kernel (6.8.5 in my case). Another work around is to enable Resizable BAR in the bios (the function is not there on older motherboards).