Ok so I kinda had a similar problem. Difference is that I was using Arch and full disk encryption. System would freeze up if I tried writing big files and disk light would start blinking.
It might not be that to so maybe run "journalctl -b -1" the next boot after your system freezes and check towards the bottom of the log to see if there are any errors, usually red.
Another way is to use btop running in the background and when the system gives any sign that it'll freeze switch to btop and check what's going on.
Edit: something that came to me is to try to switch to another tty using Ctrl+alt+number, I'm not sure how neon works so try 2 or 3 or 4.
Yeah lol especially in some country like Italy where the floor is marble