Sounds.then Comunications in Control panel. Windows can automatically adjust volume if you use your computer to place or receive telephone calls.
Not sure if that is what is happening to you but it can be adjusted if so.
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This 2D animation about monsters is illustrated in a Van Gogh painterly style
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.