1. For single-machine dialing, if a router is used, please temporarily disconnect the router for testing;
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2. Check whether the network cable or telephone cable is loose.
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3. Check whether network devices, such as the modem, are overheated. Restart the network and try again.
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4. It is recommended that you do a full virus scan of your computer.
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Rule out the above situation has not been solved, you can contact the local manual customer service to deal with the problem.