The only thing that I can think of would be to check your audio cables and make sure that everything is secure and not "pulled".
If you're hearing an abnormally loud noise coming from the unit, you may want to have the unit serviced.
I got this home theater couple of months back. After I did firmware update, I getting funky noise no audio will come when I play DVD/Blueray or netflix movie or youtube. Sometimes it goes away. Could you please let me know what might be causing it. But If watch my cable network audio is fine.
Samsung: Home theater ht-bd3252