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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3, still not, you can connect to the wireless network in other places, try to see if this situation will occur, if not, it is a network problem, if it is often disconnected, it is a mobile phone problem.
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4, if the phone problem can try to restore factory Settings.