Try cleaning the contacts of the Holder and the Pocket Charger
If you are simultaneously charging Pocket Charger as you are charging your Holder it is important to charge the Pocket Charger with using the compatible power adaptor and cable."
Place the Holder in the Pocket Charger and reset it by pressing the Pocket Charger’s button for 10 seconds. Keep the button pressed until you see all the lights dim out. The RESET will be confirmed by all the lights briefly blinking white.