1) Check whether the equipment is power-off or disconnected from local network, and recharge or reconnect it and then try again.
2) Check whether the local wireless network has signal delay or disconnected, and restart local router or check local wireless network and then try again.
3) Check whether local 4G/WiFi signal is available, and sign in the App and then try again.
4) Check whether the charging dock is too far away from router and impairs networking, keep it closer and then try again.
5) Check whether memory occupation in cell phone impair normal operation of the App, and then try again.
6) Restart the equipment and run the App, and then try again.