Thanks for the good discussion everyone and the quick research Nicco. Whenever I see some fault with a keyboard like this I usually want to check the physical connections first. More often than not a cord is loose or a USB port is not working properly or maybe even a wireless connection is getting disturbed. To cover these minor issues I'd ask that you try reseating the plug in another port, on another computer and clear away anything which may interfere with the signal (if it happens to be wireless) like computer speakers, the monitor, other controllers, routers, etc. Once all that's checked you'll want to get into software issues; updating drivers from the website, checking the device manager to see that there aren't any other (maybe older) devices interfering with this one, and uninstalling/disabling them if there are.