There are settings on the client (when you install the FOG client service) AND on the FOG server (service settings for this particular host)! Are you sure you set both? Maybe reinstall the client just to make sure!
The other thing that comes to my mind: Do you have SSD hard drives?? If yes you need to change the startup type of the FOG service on the client to “Automatic (delayed)”. See here: [url]http://www.coretechnologies.com/WindowsServices/FAQ.html#DelayedStart[/url]