Assume you have a Client system with Dagent installed. You run Sysprep Audit mode on the system to make some changes and then shut the system down and create an image without exiting Sysprep Audit mode. If, after you have also installed an update to GSS 3.0, (such as updating from HF1 to HF3), that audit mode image is redeployed and Dagent checks in it will attempt to update to the latest agent version. This attempt will result in a reboot loop.
If you require an image of an OS that is in Sysprep Audit mode, that image should not contain the Deployment Agent.