Microsoft has just released the following KB Article:
Configuration Manager PXE boot causes Windows Deployment Services to crash
Symptoms:
You use a System Center Configuration Manager PXE service point (Configuration Manager 2007) or a Pre-Boot Execution Environment (PXE) distribution point (Configuration Manager 2012) to perform PXE boots. In this situation, the operation first appears to work successfully, but then the process stops running. When you examine the server on which the PXE service point and Windows Deployment Services(WDS) are installed, you discover that WDS has crashed.
When you restart WDS on the server, this does not resolve the issue. When you restart both the Windows Management Instrumentation and WDS, or when you restart the server itself, this may temporarily resolve the problem. However, the issue eventually recurs, and WDS crashes again.
If you try to reproduce this issue by continuing to perform PXE boots, you discover that although the issue may occur frequently, it cannot be reproduced on a consistent basis. The crash behavior occurs randomly.
When you use Event Viewer to examine the WDS server on which the Configuration Manager 2007 PXE service point is installed, you find that the following errors are logged.
Full details at:
https://support.microsoft.com/en-us/kb/3046055