Comment 4 for bug 883443

I think this has to do with the persistency of the notification. My guess is that the ubuntu network manager (or some other software) sends the notification with the 'persistent' flag set. In Unity, this doesn't matter (all notifications are transient), but in gnome-shell, it makes a difference.

Can you confirm that this only happens when you have been disconnected before? Also, does ik go away when you click it? That's the behaviour I'm observing.