Group Policy Preferences Files size limit

Hi

I am trying to use GPP to copy some files from a network share to desktops. All the files copy except one which I believe is due to file size, however I can't find any documentation to suggest that there should be a size limit on files that can be copied - does anyone know if this is the case?

For info I am running Server 2008R2, Windows 7 Pro and the file is around 8MB. I get the following error message: Group Policy object did not apply because it failed with error code '0x80070040 The specified network name is no longer available

If I use a file splitter and cut the file down to 4MB it copies, any bigger and it fails. Is this by design? Is there a way around it?

Thanks

Karl