Hi @nalinipatil03 whilst could be sever issue more often indicates a connectivity issue. Firstly try a soft Reset of the Tv, hold power button in on remote for around 5 seconds until the Tv Reboots,afterwards reset the Smart Hub.
However may need to reboot both the Tv and your router, unplug from the mains for around a minute before reconnecting.
However if that does not work may need to change the DNS settings from Automatic to Manual. Go to Network-Network Settings-IP Settings-DNS Settings-change from Automatic to Enter Manually. Enter 8.8.8.8 or 8.8.4.4 (google servers) An alternative one is Open DNS which is 208.67.20.20 or 208.67.22.22 some information here https://www.techradar.com/news/best-dns-server
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
