Now I had a kernel crash on resume from standby over night.
The SHIFT KEY was blinking and I just saw a black screen and my mouse pointer.
Edit:
And it happend again after standby.
It seems it happens since upgrading the nvidia-dkms driver from 560.35.03-2 to 560.35.03-3
See upgpkg: 560.35.03-3: Use egl-gbm package instead of included binary blobs (61a16ad9) · Commits · Arch Linux / Packaging / Packages / nvidia-utils · GitLab
It uses now the egl-gbm package instead of the included binaries.
https://archlinux.org/packages/extra/x86_64/egl-gbm/