If too many people log in, a QR code may be generated, which is always a network anomaly.

Generally, the network is not normal. Check all the lines to see if they are accidentally dropped. If connected, make sure that all power cables and signal transmission lines are connected. If your mobile phone can be connected to your wireless WiFi computer, restart the computer decisively. Sometimes your computer settings will be modified by some junk software, which will make it impossible to surf the Internet. You can choose to restart your computer or reopen your browser.