If your Studio or Studio Wireless headphones aren’t charging properly or you’re having difficulties with sound, try resetting your headphones.
RESET
Press and hold the power button for 10 seconds
Release the button
The Fuel Gauge LEDs will all blink white, followed by one blinking red
When the lights stop flashing, reset is complete
Your Studios will automatically power on after a successful reset
This feature helped me.
Hope it will help you too.
Best regards