NVMe device dropped offline, if it's a reoccurring issue this can sometimes help:
Some NVMe devices have issues with power states on Linux, try this, on the main GUI page click on flash, scroll down to "Syslinux Configuration", make sure it's set to "menu view" (on the top right) and add this to your default boot option, after "append initrd=/bzroot"
nvme_core.default_ps_max_latency_us=0
e.g.:
append initrd=/bzroot nvme_core.default_ps_max_latency_us=0
Reboot and see if it makes a difference.