Dos network Boot Disk Error And Solution

I have a dos net work boot disk mapping a drive using TCP\IP proticoles.
when i boot i login and drive maps ok.
But when running Ghost.exe ver4 to clone disk i get an error when the cloning process is between 2 and 9 % complete the error is
(error geting Dos Disk Free)Any suggestion on fix or how to keep connection to server stable would be most appreciated.