1. Check if there is any dirt inside 耳机铜柱及充电盒pogo pin
2. Lightly shake the earphone box to ensure the earphone and pogo pin are closely touched, and check again if it recover.
3. Put the earphone in the charging case and connect the charger for 10 mins to check if it can recover
4. Open the case and long press the pair button for 10 sec, wait until the notification light is on and search again.