[ownedbycats]

Is it possible that they switched back to an older version of dosftools, perhaps by mistake?

For what it matters, before upgrading to 4.31, I only got the error after deleting a book in Calibre and then reconnecting.

After 4.31 was installed, I started getting it on about half of my reconnects, though it didn't have any pattern to it.

Then I downgraded and stopped getting entirely.