After the update, sometimes it's possible that you need to reconnect to the wireless access point (router). Have you checked that?
As well, try to de-activate your player on the Netflix website, and then add it again to see if that helps.
Keep me posted.
When I first hooked up the Samsung HTC-6600, Netfix streamed without any issues. The next day I received an upgrade from Samsung and since then Netflix will not stream correctly. Multiple buffering issues then it just stops streaming. Has anyone else experienced this and if so, did you find a fix?