If this happens in a specific channel, please let us the channel name and we try to check from the server side.
1.First rule out the network problem, check your network, try restarting the router, if the WIFI is connected, try to switch the WIFI Band, such as 2.4G to 5G, or change the WIFI channel.If it still exists, please check whether the connection using the network cable is normal. If it still exists, please go to the next step.
2.Try cutting power to the set-top box, then restarting it.
3. Factory reset Tanggula box
4.If still , Please contact with US.
This kind of problem can basically be concluded that the network is not connected, try to set the network