Battery charging

Charging from 15% to 80% is normal. But at over 85%, charging very slow and 85-100% need 40mins. My usb cable and adapter are good. I don't know why? It becomes after upating flyme6 stable version. Help me how to fix it. Thanks😁😁

Looks like your connection to Meizufans was lost, please wait while we try to reconnect.