Windows 7 Restarts at Capture step ConfigMgr 2012 R2

The title says it all, I am currently building and capturing a Windows 7 Enterprise x64 image at a customer site using ConfigMgr 2012 R2.
When the Task sequences gets up to the capture step it spontaneously reboots and I end up with a 0kb .wim file, not much use...

The logs however show the following:

See the reboot pending?. Add a reboot in between your Prepare OS and Capture the reference machine steps and you may find you have a bit more luck with it ;)

(Also despite what it may look like I had full network connectivity at this point)

Possibly a bug with R2, I'm not sure but either way its a suitable workaround

Cheers
Wayne