LVM PV missing on boot - dropped to initramfs shell
HDDs die. SSDs die too. If you care about your data and your uptime, implement RAID and continuously monitor its heath.
Use smartctl --all /dev/sdc to see device status. You'll see SSD wear and other attributes, some last errors, and you'll be able to initiate device self test and see its results. It's wise to check that for storage devices and do that moninoring regularly. As far as I can remember, Ubuntu has that configured by default and you are advised to check system logs for SMART monitoring messages.