I have a problem with my sound/sound bar on my Galaxy TV Series 3 L3 360, Model # LN32B360C5DXA. When I set the desired volume after a few minutes it goes to zero. I can reset the volume with my remote or on the tv using the tv's controls with the same results. The tv is connected to a cable box via an HDMI cable. I have ran diagnostics furnished by the tv and everything works. I'm not sure what to do at this point. Has anyone had a similar problem? Any suggestions?