I purchased a pair of R-15pm's to use with my computer. I have been having an issue with certain movie files MKV and now Netflix when I start to watch a movie with these speakers connected via optical connection or via USB connection. It seems the speakers do not like certain files. Most audio works fine but when I try to play certain files or watch Netflix I hear a popping sound right at the beginning of the movie and the speakers will not play the audio. I thought maybe there was a firmware or something I might need. I cant understand why this would happen. Any ideas.?