Popup window "Norton LiveUpdate-restart required"

About hourly, I get a dialog box on my screen that says "Norton LiveUpdate--Restart required".  then it says "To receive the most current updates, you must restart your system.  What do you want to do?" Then a dropdown box showing a choice for "Restart now (recommended)."  There is also an OK button in the lower right, and what looks like the Norton logo in the lower left of the dialog box.

But when I go into my Norton 360, it tells me that I'm already up to date with all current updates.

So is this recurring dialog box a scam, or is it really from Norton?  Thanks in advance.