Is there a fix for Mountain Lion audio output settings after the laptop goes to sleep and wakes back up?

Mac Book Pro running Mountain Lion OS X 10.8.5 after the notebook sleeps audio and video does work (for example on YouTube).  I have been able to temporarily work around this by toggling the settings on Built-in Output in Audio Midi Setup, Audio window between 2ch-20bit Integer and 2ch-24bit Integer.  But this is a temporary fix until the laptop sleeps again.
When it's not working, all system sounds (emails "dings", delete file "swish", etc.) are silenced, and video playbacks on YouTube and elsewhere freeze and have no audio until the Audio Output settings are toggled then they all immediately start working.
Has anyone encountered the same?  Have a long term fix for this annoyance?
I cannot upgrade the OS to 10.9 Mavericks yet because of a corporate policy - there is some conflict with 10.9 and our corporate VPN connection.

Apple support article:
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You can try to check your hard drive.
Apple Hardware Test doesn't catch everything, so even if it doesn't find a problem, you could have one.
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