@Northguy
It might be the same issue, but I never observed the file-size of the book to shrink to e few kb.
The e-readers just said that the e-Pub was corrupted (see attachement) when served with COPS with the setting
$config['cops_update_epub-metadata'] = "1";.
However I never tried your Sony (?) e-reader.
The same problem might manifest itself in different ways with different e-readers.
@vlad59
Maybe you could see if there is a difference between the original file (Calibre) and the file "served" with COPS if that file was unreadable.
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