I found this while googling this issue for a while.  I originally had this problem start when using Winamp and shoutcast where the music would be all skippy and garbled and whatnot, so I switched to XiiaLive.  XiiaLive would not even begin to play, it would constantly buffer, stop, buffer, stop, etc.  I tried with 3G/4G and neither worked, but WiFi worked like a champ.

After contacting sprint to get a new PRL update, the person on the chat was absolutely useless, and I am sure he just hit "refresh" or equivalent on my number, so the "new" PRL update I got was useless.  He then proceeded to tell me he was not allowed to give me my MSL code.  Long story short, he got a terrible response on his satisfaction survey.  30 minutes of my life I will never get back, I suppose.

ANYWAY.  I ended up contacting Sprint on the phone, and had the code within 5 minutes, made the suggested changes, and within seconds XiiaLive was streaming SomaFM mpeg stations, and Winamp Shoutcast streams were working again.

Fantastic help, Thank you!!!