Should you attempt a repair in Recovery mode? Is it just a warning? How to identify the file or folder with a problem, and what to do to fix or prevent it from recurring.
warnings
First Aid in Disk Utility, or running fsck_apfs in Terminal, return warnings or errors on one of your Mac’s volumes. Here’s what to do next.
When you’ve worked out which files or folders are causing errors in APFS, what can you do to ensure they don’t recur?
Have you glanced at your logs recently? Are they full of incessant message diarrhoea?
The Eclectic Light Company 