Hi KalyaniBalaji,
first of all try to move / turn the router or reposition the antennas.
Otherwise access the router> wireless settings and try to change the radio channel.If you use the 2.4 GHz band, try channels 1, 6 or 11 if you use the 5 GHz band, set the channels 48, 149 or 161
https://support.microsoft.com/en-us/help/4000461/windows-10-wifi-problems-home-layout