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I recommend that you change the encryption type in the Wireless Security Settings section of your router. Generally, WPA-PSK WPA2-PSK item is selected, authentication type WPA2-PSK, and encryption algorithm AES is selected. Don't choose automatic, if you choose automatic, sometimes other people's mobile phones can be on you, you may not be able to get on, and there will always be problems with identity verification.
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WF signals interfere strongly with each other, and after disconnecting, the mobile phone can enter the wireless routing password from the new, and it can be done.
Different mobile phones have different wireless network cards and different signals to accept.
If you can use your mobile phone (WIFI master key) to also surf the Internet, I have a trick to connect the computer as well. >>>More
It may be that the channel is congested, and if the channel is not set, it is automatically selected, and the power is off and restarted.
Factory reset the router.
It may be that the shielding effect of the load-bearing wall is too strong, how much radiation is there if it is penetrated by the signal, it is too unreliable in the family, the simpler way is to buy two wireless routers, and the more complex method is to make an antenna in the living room to receive, and you have to consider the problem of lightning protection......