I downloaded and installed these [virtual machines](https://github.com/xdissent/ievms) for IE8/IE9 web development, IE9 stays running but it appears the IE8 VM is constantly shutting itself down, and it is saving the state (it doesn't boot fresh) so I think it is Vbox. How can I debug what is causing this specific VM to shutdown. It is stable when I use it and only happens when I am not watching it, it never happens when I am using the VM.