I use the default music player with a bluetooth speaker & in the car. The music will go quiet like a skipping track, but the music doesn't stop, it comes back in at the right point of the song. It's just as though it's randomly muted. I have looked online for fixes & I've cleared the cache partition twice. This helps the issue for a couple weeks, but doesn't fix it. I've had this issue since I bought the phone in early December of 2014. What should I do?