I just get a 630x and a Samsung Smart TV. What bother me is the 630x is much more complicated and unstable. I used to cast alot of YouTube. The first clip normally ok but when continue the second clip it will become black screen with sound only. Now, I can't even cast any because my Smart phone can't find the TV! Tried restart tv, restart Wi-Fi and my phone but still the same... any sifu here can advise?