I am also having this issue, I am loading 40 HP Laptops with a pretty basic Windows 7 load. I am multicasting them 4 at a time (limited lab space).
It worked perfectly on the first 10, then I started getting the error on one of the four. I would leave it in the group and retransmit the image. It would fail again and I may get another that fails. I left 4 on unicast over night and when I came in, all 4 had failed.
It is the progression that has me a little stumped. Should not be an image issue, because it has worked.
Anyone have any thoughts? I am at a loss...
JKling