Azure VM Instance Stopped For No Reason

Hi,

I have a Azure VM instance running a website and this morning (July 26th, 2013) around 6:30AM EST for no reason, it appears to have shutdown, it did not recover until I logged into the portal and clicked "Start".   Windows showed the unexpected shutdown prompt when I logged into from RDP.

Any reason why this would happen?  I understand it might need to reboot for updates/host maintenance but it should restart the instance automatically, no?

This is scary.  I am concerned about deploying production code to Azure until I understand what happened yet..

Thanks,
Chris