If Netflix and Samsung failed to resolve it Samsung should have arranged for a tech to come out. There have been reports that a new mainboard clears such things up.
The Netflix app worked fine for the first month of owning the TV, then one day - I think after an update - it stopped working. Instead of loading up, when I open it, it goes to a black screen, and after a moment it switches back to whatever channel I was on before (HDMI 1).
My TV is model UA55F8000AMXXY version number TH01, if that makes a difference.
I have found a similar thread here which had a number of different solutions - none of them worked for me.
I have tried:
-Factory reset
-Changing the DSN
-Uninstalling and reinstalling netflix
-Turning off auto app update, switching the smart hub country to Germany (where there's no netflix) to UK to USA
-Calling Samsung and getting the level 2 Tech guys to do a hard reset
Nothing has worked so far. Is it time to ask Samsung for a new TV while I'm still under warranty, or do you have another solution?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic