Hey @thanh.huynh
Thanks for your feedback.
As I mentioned in this thread How to handle internet disconnection properly .
The Video SDK keeps a heart-beat connection with the server, but the messages are not sent every second. So the Reconnecting state cannot be triggered immediately and when the reconnecting event is triggered, the SDK will try to connect the server. If the network is unavailable for now, then it will return the Fail state and will not try to reconnect anymore.
Thanks
Vic