Hello, this happened to me too. By the way, I tried to fix it for my gaming and communication purposes. All the necessary settings under "Properties" were already disabled, but the gain level still kept adjusting automatically (though I still recommend doing this). However, I discovered the issue on my PC when I checked the 'Permissions' settings.
Here's how I fixed it under "Microphone Permissions":
- Go to Settings.
- Navigate to System.
- Select Privacy and Security.
- Click on Microphone.
- Look for "Let apps access your microphone" under Microphone Access (the wording may vary depending on your version of Windows).
- This part can be tricky: find the app that might be automatically controlling the gain level while testing your microphone. If you can't find it, try turning apps off one by one while testing your mic under Properties > Levels to see if it still automatically lowers.
In my case, I turned off the XBOX app.
Now, the microphone no longer adjusts its gain automatically.