I'm Having a similar problem, lately.  Streaming via internet/website on my iMac (which meets minimum specs), Pandora will play 2 or 3 songs, then freezes at 'DishTV' ad, and does not resume playing.  It did play again after I erased ALL cookies, etc., but froze again when the same DishTV ad came up.  Seems to be a problem on Pandora's end.   ... View more