You can try the following methods to solve the problem:
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1, cancel the wireless connection and reconnect. Click Settings --WLAN, select the arrow next to the name of the network you want to connect to, choose not to save the network, and re-enter the password.
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2. Restart your phone and router and try again.
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4, if the phone problem can try to restore factory Settings.
On airplane mode
When you find that the phone signal is not good, you can try to turn on the flight mode, and after the flight mode is turned on, you can wait for a while and then turn it off
You can restart the phone to restore the phone signal, restart the phone is also a good way, generally restart the phone, the signal logo will re-appear.