Discovered this by accident looking in to a different issue. I can’t stream VOB files without it stuttering and losing sound, started the painful exercise of converting these files to ISO files which stream fine. I was looking into a problem I’m having with DVD shrink which made me think if this may solve my current problem streaming VOB Files. The issue being storing the files on an external hard drive, in my case drive F. I transferred a folder with VOB files to my C drive and hey presto this streams fine with 5.1 sound, menus, extras etc, etc.
Hope this helps someone experiencing a similar problem, my issue now is what to do about this, continue converting the files or buy a larger capacity C drive.