Thanks for your reply. I have to say, I don't think it's chatter. I just plugged the keyboard again (it rested in a corner for a few hours), and it has been working perfectly for the last four hours. My prime suspect would be the controller, but it will have to wait until monday to check the insides (or set itself on fire before that). I know that "browns" are common and not that great in some cases, but this MX-11800 is my first mechanical keyboard, and I would hate to retire it so quickly.
I have seen that G80-8113LUAUS you're talking about. Nice, really nice, too bad I'm probably a gazillion miles away from you. If I have to import a keyboard (and fight hordes of vicious and greedy customs officers in the process), it will be a model M.