In order to understand your environment, can you please provide the version of Deployment Server, the preboot environment used whether WinPE 1 or 2 or even Linux preboot, whether you are using PXE or Boot CDs, what OS are you deploying with the image, are you using Ghost, RDeploy, or WIMs for your imaging engine, etc... This will help to understand what you are using and narrow down where you are getting the reboot. Thanks.
Nate Hudson
Senior Systems Engineer
West Bend Mutual Insurance