I have had problems with several of the keyboard keys since I first received the laptop. The vendor did advise me to "spray" or continue to use the keys so they would loosen up. I reported this within a week from receiving it. I disagreed with them, but here it is several months later and I still have to bang especially on the number keys in order to make them work. So, I suppose now I'll be using my warranty protection plan to try and get this issue properly resolved.