1. The wifi display is disconnected, which may be a problem with the router, password, network cable, connected device Settings, and so on.
2, the first thing to see is whether the wireless password has been changed, which is very easy to confirm.
3, if the password is correct, it depends on whether the connection Settings have been modified wifi Settings, you can try to restart or restore the factory Settings to connect to wifi again.
4, check whether the router's light is normal, you can detect whether there is a problem with the network cable.
5, the router can also try to restart it, and then call customer service to ask if there is a problem with the operator.