Occasionally, I will have one or more of the modifier keys pressed, but Windows acts as though it is not. For example, while ctrl+tab-ing through tabs, suddenly one is selected and a tab character is entered into the document. Or worse, ctrl+v enters a "v" rather than pasting from the clipboard. This behavior starts seemingly out of nowhere, but once started, it continues sporadically until I reboot. Perhaps coincidentally, today, it seemed to start around the time I used a four-key shortcut: ctrl+alt+shift+r.
I'm using Windows 7 with a Microsoft Natural Keyboard Elite keyboard (my long-time favorite). The keyboard is plugged in via USB into a Dell docking station.
Is this most likely a hardware or software issue? If it's hardware, Microsoft has been good about replacing faulty products. Otherwise, if it could be software, is there a known solution, or something I can try?