FTP move should not be an issue or we should see a somehow FTP related error message - which would happen much later anyway. To me it seams like the image/VM might be corrupted. Although disk space and inodes are not running out yet.
@mecsr Have you tried running chkdsk /f within the client system as suggested on the screenshot??
I really don’t hope that this is the case but could it be the server disk is failing??