They should have you checking:
a. Firmware version.
b. Date/time setting.
c. Try the 188.8.131.52 DNS.
d. Resets (factory, power removal and a Samsung remote reset.)
Samsung's services have been in the news but you won't know if there's an issue unless you call.
We have a smart hub tv purchased in 2015, and it works great most of the time. Yesterday, while watching Netflix, the show sputtered and turned off. Since then, I can navigate to every video in their library, every video in the Amazon prime library, every video in the HBO library but none of them play. Each player gives me their error - having trouble loading your video - and it's not the network. I've tested both cable and wifi and the router is directly under the TV. It seems there's either a Samsung network failure or app updates?
Can anyone confirm the same issue or help with a solution?