17" unibody - volume keys stop working

after some time the f10/f11/f12 volume buttons stop working, (even the volume icon in the menu bar stops reacting) i have to go to sound in the system preferences pane to control the volume, or log out, after loging in they will work for a while - this can happen a few times a day
i didn't figure out what triggers them to stop working - does anybody know this problem or has a possible solution?

thank you for your reaction, it solved the problem temporarely,
but the problem returned,
it looks as if it is triggered by using a headphone, after plugging them out, the keys don't
work anymore
also with skype the sound acts strange, only the right speaker of the computer works - with
headphone both channels work - when i play itunes, both speakers work
i think i should do some testing with different programs and different headphones to isolate
the problem - suggestions are more than welcome
sam

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17" unibody - volume keys stop working

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