Hello Nathan, I think i have a solution to your problem if you could just follow the link i provide. http://www.howtogeek.com/67660/how-to-diagnose-and-fix-an-overheating-laptop/

First remove the key that isn't working and search for debris under where they key was. Next clean that spot thorough so thats their is nothing blocking the key from fitting in its respective spot and clean the key before replacing. If the key isn't the problem and it is still not working properly replace the keyboard or bring it to your local repair store.