Comment 6 for bug 65249

Yes, I've also thought if there might be a hardware issue here. I'm not excluding this as a possibility, it's just that more events are hinting toward the opposite. If I suspend the PC and then awaken it the problem may be gone. Sometimes keys that I haven't even touched start making the problem. I know, because at that time I have been using an external keyboard and tried to press only one key on the laptop's keyboard. Stuff like that...
But it's always a good idea to try to clean it up. I just haven't had the courage to do it. I'm afraid after that I won't be able to put it back together.