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Hi,

I have is that my speakers volume increases and decreases by itself while the system volume (mixer) is unchanged. I am using Xonar DG Pci 5.1 but I am quite sure its not my sound cards problem because the same problem occured when I was using sound blaster VX 5.1 .Moreover, I have also changed my motherboard, so I believe the problem comes from the speakers. However, I gave my old motherboard and sound card to a friend, who has told me that he has the same problem (He didn't have it before). What could the problem be?

Please help. 

I didn't find the right solution from the Internet. 

References:- 
https://bit.ly/2tPmzx8
Motion Infographic Animation Company

Thanks!