Welcome to Android Forums. Sorry for the delay in responding to your question.
Try this:
Turn off the router and disconnect from power source.
Go to the WiFi settings on your phone and delete that network. Power off phone.
Wait 5 minutes.
Turn the router back on and let it fully reboot.
Turn the phone back on. When fully rebooted, sign into your network.
For more info and phone specific support go to your phones specific forum here at Android Forums.
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