I don't know if this is normal for your model, as it's a non-US model, and I have information only on US models. This model appears to be a South Africa model. (Correct me if I'm wrong.) But you can contact support for this product here: http://www.samsung.com/africa_en/consumer/tv-audio-video/television/led-tv/UA46D8000YRXXA
Also, I realized I missed your question here: http://forums.cnet.com/7726-13973_102-5354576.html
But I looked over the support page for that product, and it doesn't appear to have any new firmware. But you can ask the support team in your country.
I have a problem with my TV (TV's model UA46D8000) When i watching 3D movies from AllShare shared server my TV is buffering every 20, 10, 30 seconds. Is this normal?