@Vivek1998 

Network drop or network instability?

Check the physical connection to see if there is a problem with the network cable or port.

Try to connect different devices to the modem/router to see if internet occur.

What has changed about the lights on the router?Has the router updated to the latest firmware?

Can you log into the router configuration page to see the error message?

  @Vivek1998 refer to What should I do if I cannot access the internet through Wi-Fi router? | TP-Link

Troubleshooting: Unstable connection on the TP-Link router