Volume changes randomly and overlap icon

Whenever Im browsing or watching a video or hearinfg music, randomly at times the volume turns down. I have tried to search for a solution but I cant find any porblem similar to mine.



This is what I see when I check out de mixer, when I move the pointer the transparent one dissapears and the volume is set to the pointer I moved.

Any idea how to fix this??

I dont have speakers, instead I use some Logitech g430 headsets. I tried what you said and this is what I got so far:

Using Windows Media Player, I heard music for 25 minutes, in 3 songs the music stopped with no reason, but the problem of the double pointer didn´t appeared.
After that I changed to Itunes, after 7 minutes of hearing music the problem reappeared:

It also appears to affect Roblox.exe which also has the volume down,but I wasn´t using it.

I have recorded the problem

https://www.youtube.com/watch?v=QSZrZdDZiJg

Also , when I change the volume with my mouse this happens:

https://youtu.be/MLMqLJr0cYQ

I guess the headphones are using its built-in soundcard (check title bar of screenshots, same for my Logitech G35 which has its own soundcard)? How else can you get 7.1 surround on a regular jack?

The Logitech website says it has a USB adapter, does it mean it has regular jacks but also can function as a soundcard of its own if used with the USB?

The headset includes a Microphone and Headset jacks to USB, using USB enables to create a 7.1 effect while plugin the jacks directly wont make any effect, they also como with a Volume scroll wheel and a mute button

This is the screnshot of the Devide Manager Soun section, I think it is a built in soundcard in the motherboard

Ok, so if you insert the jacks your default soundcard should be used. If you are using the USB adapter it is the Logitech soundcard being used.

Do you get the same issue with both of these methods?