itunes internet radio station keeps automatically changing

about 80% of the days that I'm listening to the "Internet" radio stations in iTunes, I get the occasional automatic channel change. It has happened while in the normal window, minimized window and the miniplayer. also it happens when the window is the active window on my desktop or not. It is not at a regular interval of time and it always just progresses down by one channel.. It started last fall I believe. I used to think it happened when I had a specific application or game up but I have not been able to narrow that down either. it has happened on my work pc and my home pc.

Has anyone else experienced this?

thank you for any reply