Ever since my Samsung TV has updated to version 1460 of the software, I need to reboot my TV in order to watch the Netflix app. Once Ive finished watching it, turn back to TV mode, and then try and launch the Netflix app it just hangs with the red circle going round and round. Only a reboot fixes this.

Info here.

https://downtoday.co.uk/samsung-tv-smart-hub/

If your problems persist, you could try contacting their tech support.

http://www.samsung.com/uk/info/contactus.html