Was about to switch for the 3900 but, I do like much of the new specs on the 4900.
***opted to keep using the remote that came in with my 3900 (which works 100% better)
Now lets try to fix the buffering...
1.- Reset it many times (still buffering) only channel 1 (alzahra) was perfect.
2.- Changed the server 3 times (still buffering)
3.- I disconnected the ethernet cord I'm running it off Wi-Fi now and it works perfectly. So I guess I can't use ethernet.
4.- Not choice but to stay on Wi-Fi
maybe check your ethernet cable