After that, restart your computer and see if Windows 10 automatically lowers volume. Step 3. Click on Apply to execute this change. Then select the Do nothing option under When Windows detects communication activity. Step 2. Navigate to the Communications tab inside the Sound control panel window. Press Win + R keys to open the Run dialog box, and then type mmsys.cpl and hit Enter. To fix the issue, follow the steps below to disable the automatic volume adjustment feature. If this feature is turned on, you may encounter the “volume keeps going down” issue when running some programs like Discord. This is a Windows feature designed to automatically adjust volume when using the PC to receive telephone calls. Disable the Automatic Volume Adjustment Feature