iTunes skips to next item in playlist, even though item is a stream.

iTunes annoyingly places certain streams in a playlist called "Internet Songs", or at least iTunes used to have that behavior. Anyway, often during listening to one stream on this playlist, iTunes will spontaneously start playing the next stream on the list. I have not touched the function keys when this has happened. Indeed, it has happened when I was not in the room. This only happens once every couple of hours or less, but I can count on it happening at least once a day, since I listen to the radio streams a lot. It seems to be related to problems previously posted, but given the relative infrequency one might experience this problem listening to songs, it might not be as noticeable as it is to me.