I like to keep my UCP always open as a tab in my browser. But it regularly shows me this message and I have to refresh the page to make it go away.
The Voicemail widget has it’s own refresh button to make the widget check for fresh voicemail - and I know to use that if I want to see if there is anything new.
But this popup comes from just leaving the ucp page open. When I go away from my computer and come back, there it is.