Two days ago, all of a sudden all four of my C420 cameras stopped working - unable to see live view and receive notifications. The cameras are connected to a H200 hub. Sometimes the cameras have shown offline status. Other times when I am able to go into settings, it would keep spinning until it briefly displays a message saying something like "An error has occurred, please try again later". All cameras and the hub are showing green LED status light. WiFi has been working properly and no changes have been made prior to this problem. 
 

i have tried rebooting the hub and the wifi network multiple times but the problem still persists.