When operating in App, it is slow/lag/always waiting for reactions.
To better solving your problem, please do the following before asking help from distributor.
Use LAN cable instead of WiFi for the main box.
Try restart the router used for the main box or your phone.
Disable any VPN connection from your phone or router, for directly connecting to the Internet.
In the main page of the App, tap the [Net Status] to see if the networking of the main box is working right.
If there is any bug or question, please send emails to firstname.lastname@example.org