@ndalby Thanks for your response. @tombaito @lance5 There is some troubleshooting that we can try:
1.Please adjust volume down(-) button first and then press the volume up(+) on your phone.
2.Place the earbuds back to the charging case properly and taking them out again.
3.Double tap both earbuds simultaneously.
4.Go to the Bluetooth menu on your device and select "Zolo Liberty+".
5. Please try with a new device.
If this not works, I am afraid there might be something inside the filter. Just check with your finger, if the gold filter mesh is a bit sticky, if that's the case
A. Connect the liberty+. Put a song on and set the volume to max.
B. Get a cotton stick put a bit of alcohol on it.
C. Use the cotton stick but gently rub/clean the gold filter mesh.
Don't forget, when you do sports the liberty+ will get in contact with your sweat - so cleaning them once in a while won't hurt them.
If not helps, feel free to contact email@example.com with your serial number and order number.