Hi Allan,
No, it's really strange, I can run for several hours without seeing it then all of a sudden it will appear. I can dismiss the popup and not see it again but sometimes it will appear with regular monotony every 5-10 minutes. I don't change anything and it will vanish and I might not see it for a day or two.
I have just removed ITunes (what a job that is!) and will see if that makes a difference.