Do i add this line in "GRUB_CMDLINE_LINUX_DEFAULT=" or?I came across this somewhere else so it might be worth a try, there seems to be a bug where an nvme ssd is sometimes not recognized, add the following to your grub and generate a new grub.
Then reboot your system or just see if your problems happens again or not.Code:nvme_core.default_ps_max_latency_us=550
Solid state drive/NVMe - ArchWiki
wiki.archlinux.org