I am assuming it has to do with packet loss or some kind of internet disruption. If I connect or am disconnected from vpn, it always happens and for several seconds... that is when it is the worst. Also just doing other things that hit against the internet, opening other pages will cause it. Pandora obviously does some caching... I just pulled my internet cable out and it still continued to play so I'm not sure why vpn dropping would immediately cause it.
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