Mounted disc's files show as empty in Finder window

I have about 300mg of data on an external My Passport for Mac. Usually works fine UNTIL I ran the WD utilities full disc check, just to see if everything was good. The check ran fine, but ever since, the files don’t show up, though the disc is mounted. It shows up as fine and holding data in Apple Disc Utilities, and when I restart, the files show up, but if the MacBook sleeps, the files don’t appear again. I’ve had so many problems with WD, thinking of switching companies and going SSD.

Macbook Pro 2019 / Big Sur