Having this exsact same problem. Im running Landesk 9.6 on server 2012 R2 ( core server) and when i try to deploy 23 machines 3-4 of them fails with unattended error.
Windows reporting either fail to read the file, or a line in the file could not be read. The strange thing is that it is a random line everytime. And there is nothing wrong with the unattended file, on the rest of the 20 machines :
i might try to do the image process differently also by closing the image before capture, ( instead of audit mode)
But either way if it is landesk or Microsoft, its very unprofessional.
Sysprep is not a new feature :S