That many at a time is an attack.
As far as not signing off? It could very well be you are not logged off all the sites you have logged onto as well. My computer settings are such that when I logoff, I delete browsing history and cookies, and all those other shenanigans automatically. Some sites I will close and restart my internet after using. Ebay? That's a biggie.
Or, Sirius and Nebula are just funning us. Y'all just funnin' us, kids?