Please follow these troubleshooting steps:

1. Disconnect the dock from your laptop and all devices for at least 5 minutes, then reboot your laptop and reconnect the dock to test if the issue is resolved.

2. If you're using a MacBook, go to System Settings > click Sound > select the Output tab > choose Anker USB Audio.

3. Test the dock with a different laptop.

4. Try using a different pair of headphones.