1. Network cable failure; 2. Modem failure; 3. Network card failure; 4. Modem settings themselves; 5. Problems of network operators.
The treatment method is as follows:
1 Please reconnect the network cable and telephone line and restart the cat test;
2 Please disable local connection before enabling local connection;
Please reinstall the network card driver;
4 If you use a router, please remove it and conduct a dial test on a single computer.
If there is still no improvement, please call the local manual customer service hotline and choose the special channel for self-service fault declaration according to the voice prompt to report to Unicom.