I selected almost 1000 of my favorite MP3's to load onto my 64 gig microSD card and have been enjoying same via my S4 during my long morning exercise walks. I am alternately using either the Samsung music player or (I guess) the AT&T provide player just called "Music". Same glitch with both players. On a somewhat regular basis (about once every two tunes) the volume will drop out for a split second. It is not a killer, but annoying. Could this be buffering? Could it be something else going on in the background? The GPS is on and "Running Mate" is running.... That is about all. I am at android 4.3.
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