Hi this could be as pc builder said a problem with your speakers. The 3.5 jack connecter could have a problem or the wires inside this jack or leading into the speakers could be loose. If they are broken or loose then you are not getting a clean sound feed. The wires when the speakers are on are moving so the total contact area of the wires is varying and is causing the sound volume to fluctuate as the surface connection is made stronger and weaker with speaker vibration. I would grab a pair of speakers that you know to be fine and working 100% from a friend and put them on your system and see if the volume continues to fluctuate. If on the new speakers everything is fine then you know your speakers are dodgy. If not come back and we will look at other options Loz

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