Your J:\ drive is a network share, right? For some reason Windows doesn't like when you write/read very large files over network shares, and sometimes bombs out the transfer with that message. You may be able to get around this limitation by splitting the image (Tools/Settings/Build/File Splitting) and later using ImgBurn to burn that image from the MDS file.
Can't they just retry the read and write a couple times, before bombing out? If this is common, wouldn't it be easier to work around the problem that way?