having a very strange problem with my keyboard... the letters "B" and "N" randomaly just not work. One second they work fine then the other second they don't work. Or the "N" button stops working no matter how many times i press it but the "B" works and the "N" doesn't work.I wait about a minute then they both work suddenly. If there were something wrong with the buttons shouldn't they not work at all? Is this a usb problem? Or maybe a power problem? Anyone have a similar exp? thanks for any help in advance.