i think reset the router and conifgure the settings
1. reset using a hard pin or paper clip.
2 .open the default settings and setup user name and password
3.save the settings and reboot computer and router . i hope this helps
If resetting you router doesn't fix the problem, you can call your ISP and they will work with you through some additional troubleshooting steps. If you received your router through your provider, they will send you a replacement if needed.