Massive sound problems in Yosemite

Hi,
I have been experiencing massive sound problems with Yosemite. It basically effects everything except the sound control in the control centre.
What happens:
I can't control the sound volume anymore. Key board sound control does not respond (sound symbol is struck out), sound bar in menu bar in greyed out.
If sound symbols are not greyed out, the sound will stay on the level it currently is. Neither key board nor menu bar icon can change the volume.
When it happens:
When I plug/un-plug headphones.
When I use iTunes. iTunes will even stop playback... the only chance to get iTunes back to normal is restarting the app.
When I use Skype.
Occasionally on any incident... there is no app in particular linked to this.
What I do to get around it:
Restarting the mac... this will help until I sent my Mac to sleep or do any of the things above.
Accessing sound control via the control centre (which is work around, yet very annoying).
Killing sound via terminal does not do anything.
Btw. there is only one thing listed in the sound input/output menu.
This problem is very annoying and occurs several times daily, especially since I work a lot with sound and music. I know this an weary argument, but considering what I paid for this machine ... bla bla bla... I need a fix.
Thanks for any advice.
Andy

Hi,
Thanks for your reply.
Yes, I have. It works pretty much like any re-start does. As soon I use headphones or send my Mac to sleep, it goes back to unresponsive sound control.
Edit: Just tried it again and it didn't do anything. Key board sound control is still greyed out...
Any other suggestions?

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