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My volume level changes all by itself,without me touching physical buttons or the indicator or something at all. It usually decreases the volume every 30 seconds or so,but sometimes it mutes it completely. I can change the volume back to the old level and i get a notification bubble,just as if i was changing the volume. Any ideas why?

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closed as too localized by Tom Brossman, hhlp, Jorge Castro, Ringtail, fossfreedom Dec 26 '12 at 21:58

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I think, there is a ghost in your machine :P –  Anwar Shah Sep 25 '12 at 15:55
i'm starting to believe it to! :D –  uahug Sep 25 '12 at 16:01