Sound volume goes down spontaneously

For the last few months I have had a problem on both my macbook pro and my mac mini that they both seem to get stuck with the volume going down to zero and the volume change indicator the speaker with the little boxes below it going down to muted volume and when you try to increase the volume you get one bar of volume and the second you let go of the key it instantly goes back down. I have tried on both changing out the speakers for the mac mini and used headphones on the MBP but nothing really helps. I did a reinstall of OSX on the mac mini to see if this fixes anything. I have tried just about everything I can think of and I am trying to figure out how I can get it so that this doesn't happen.

I have tried just about everything I can think of and I am trying to figure out how I can get it so that this doesn't happen.
Try trashing the "com.apple.systemsound.plist" file then restart your computer.

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