How do I fix automatic volume increase on MacBook Air M4?

Hi,

Automatic volume increases on MacBook Air M4 are typically caused by the coreaudiod process glitching, conflicting third-party audio software, or hardware issues with connected devices. 

Troubleshooting Steps:

1. Restart the Audio Process: Open Terminal and run sudo killall coreaudiod. This restarts the background audio daemon and is a widely cited fix for random volume spikes.
2. Check Connected Devices: Unplug all headphones, USB audio interfaces, and HDMI displays. A faulty headphone jack or a device sending incorrect audio level signals can trigger automatic boosts. 
3. Update macOS: Ensure your system is updated, as Apple frequently patches audio driver bugs in newer releases. 

Advanced Fixes

• Reset NVRAM/PRAM: Shut down your Mac, then turn it on and immediately press and hold Option + Command + P + R for about 20 seconds. This resets sound volume and speaker source settings stored in NVRAM.
• Identify Software Conflicts: Third-party apps like Boom3D, Microsoft Teams, or virtual audio drivers can interfere with system audio. 
• Check Activity Monitor for multiple coreaudiod instances or conflicting drivers. 
• Test in Safe Mode: Restart while holding Shift to boot in Safe Mode. If the volume issue stops, a login item or extension is likely the cause. 

Hardware Considerations:

If the issue persists across different user accounts and software resets, the problem may be hardware-related, such as a shorted headphone jack or internal audio component failure. In such cases, contact Apple Support for diagnosis.