Broadband.
I remain online, I am just being logged out of RCU.
The "New and Improved" RCU is the only site I have ever run into that does this. Any other site will activate the popup stopper, the window shuts down along with the notification sound, I hold the Ctrl key down, click again and Im fine.
RCU pops up that Java script error (gee, another popup window) and I am logged out. Really stinks when this happens after typing a long reply to something!