OS X 10.8.5 mac mini hdmi audio output issue

I am running a 2012 Mac Mini with OS X 10.8.5 and my Mac is set for audio and video output via HDMI to my AV receiver / TV. I have recently noticed that HDMI audio output ceases to function once the computer goes to sleep. A full computer restart is required to resolve the issue which is an inconvenience to say the least.
Or is anyone aware of a simple fix?
All my software is up to date, the HDMI lead and connection works fine for video and audio works fine after a restart so it must surely be a software error. Worked fine until the latest OS X update...
Grateful for any help!

See > TS4113 Mac mini looses audio output...: Apple Support Communities and others like it, just to the right in More Like This

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OS X 10.8.5 mac mini hdmi audio output issue

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