Maybe this is obvious to everyone else, but I thought since I had a cable modem that I should pick "Large buffer size" for the streaming buffer size. Instead iTunes Help recommends the small size for fast connections and the large for slow (dial-up) connections:
If you have a fast Internet connection (DSL or cable modem), you can have the music that's streamed to your computer (Music Store previews, radio stations, shared music libraries) begin playing more quickly by choosing the Small streaming buffer size in the Advanced pane of iTunes Preferences. If you have a slower Internet connection (modem), you can choose the Large buffer size for smoother streaming playback.I tried it, and it does seem to make a difference (no more streaming popup boxes).
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