Can you please boot with the Live USB stick, then open two Terminal windows. In the first, run:
sudo journalctl -f
and in the second:
sudo fsck -f -y $(blkid -t LABEL=ostree -o device)
This will perform a filesystem check and attempt to repair any problems. In the first window you will see if there are any problems related to a physical failure. If there are any errors, make a photo and let us know. Try to reboot when the command has finished and check if that solved your issue.