I had this same problem. First time it happened, I replaced the entire drive. Then it happened AGAIN, but this time I noticed that one of the little helical gears had split and detached from its shaft. Someone kindly posted a ctb file of the gear, so now I'm trying to 1) convert the file to stl or something more common and 2) find a 3D resin printing service who would make 2 or 3 of these for me.
https://www.reddit.com/r/consolerepair/comments/tiww3w/wii_disk_drive_repair_white_mystery_piece_fixed/
I'll also be adding a screw to hold the shaft in place, as mentioned in this post.
https://github.com/BiegunskiEr/Wii-Disc-Drive-Gear
Replacing a tiny piece feels so much better than replacing the entire drive.