WOL Probleme bei SNAP Deployment 3.0

We are testing Snap Deployment 3.0 in our company to deploy images to 55 ASUS Barebones. We wld like to do that by WOL, but we faced some problems:
- WOl only works from time to time...the BIOS was updated as well as the configurations set. If i restart my PC withe PXE Server etc. and i make a new task it works (sometimes) if i start the same task again, nothing happens

- After the image is installed, the PC should start on the XP but it alsways boots into the Snap Deployment Agent, although we configured booting from HDD...

well that are the problems we have....any grateful for any suggetions..a.s we are in hurry

Thx
-Hanna