I have a Toshiba qosmio x505 that has started acting like it has a stuck key. I plugged in a USB remote key board and it still acts like a key is stuck not always the same key sometimes but does z's and s's ususaly. Cleaned it wasn't dirty. It will do it whether I touch the lap top or not can get it to quit by pressing FN key several times, but will randomly start again. Is this hardware problem or ?