Not sure if this is a bug or a network hiccup, but its consistent on v0.84. I access music on my home NAS using Fireplay from my office computer. Almost 100% of the time a song will begin loading (grey bar begins to creep right) for 1 to 10 seconds and then jumps back to the beginning and starts again, at which point the song begins to play.
Songs are VBR, usually around 150kbps average, and my ISP upload speed is usually about 480kbps. A 3m:30s song takes about 1 minute to load completely.