@chidipothu

After you reboot the router, you can log in the Web UI of the router, go to "Status--System Status“ and check if the WAN port still have the WAN IP address, also check the status is linkup or link down.

If there has an IP address, you can change the DNS Server on the router to 8.8.8.8 or 8.8.4.4

When you don't connect the cable to your computer to fill in the username and password, can the router recover the internet automatically?

Try to do a Ping test on the PC, Ping the IP address of the router, Ping 8.8.8.8, and Ping the WAN IP address on the router's Web UI.

@John1234 Also you can do a MAC Clone, go to "Network--MAC--MAC Clone", click on Clone Current PC's MAC on the WAN port.

@John1234 Thanks for your response. 🙏🏿

I tried the MAC cloning suggestion and it seems to work out, wil try a few more times over this week and the next and report the status.

@John1234  I tried both the MAC clone and the DNS method. They are NOT working. Still I've to go through below manual solution to get it up and running.

Current Manual Solution:
Pull out the wan cable from the router and connect it to a laptop directly, here it is able to connect and lets you authenticate (so I enter the usr name and passwd) and I put back this cable to router and now it connects with out any issue, this is how I am coming out of this problem and use my setup. This problem may again show up in the next restart of the router.

Pls let me know if there is anything that you would like me to try.

@John1234 for the same setting now it is going through fine consisternly since about two weeks. Thank you. Appreciate you help.