Changes are not saved on shutdown [ Linux / Jetson Nano ]

Whenever I restart my Jetson Nano (Ubuntu 18.04.06), **all changes I made are reset**. The Jetson used to work fine and no major settings have been changed. There are also previous changes on the Jetson Nano that don't disappear when restarted. **To clarify: Changes ANYWHERE on the machine are not saved after restart/shutdown and I'm not using a live USB** I have tried accessing the computer directly with keyboard/mouse as well as through ssh and ensured that the ssh doesn't put you into guest mode. I also checked the disk space and there seems to be plenty. Please let me know if you have any ideas as I am currently stuck! Anything helps! Progress update: Completely stuck for weeks. I would appreciate if someone could offer any advice as I don't have the rep for a bounty.