I recently bought an LG - 2.1-Channel 300W Soundbar System with 6" Subwoofer and the first issue I seem to have is that if I lower the volume too much, it goes completely mute in some parts, most noticeably is with videos that have a faint background track, that you can only hear when a louder noise happens, then goes back to mute. Could it be an issue with my sound bar or the PC?