Check the audio source and volume
Test the headphones with another device
Inspect the cable for cuts, bends, or loose connections
Clean the headphone jack and plug
Reseat detachable cables firmly
Try a different adapter or splitter
Charge wireless headphones fully
Re-pair Bluetooth headphones
Reset the headphones if supported
Update device audio or Bluetooth drivers
Adjust balance and audio settings
Replace worn ear pads or cushions
Replace damaged cables or connectors
Contact the manufacturer or a repair technician