Guys can help me? My keyboard a Razer Tarantula has a problem, the key x and z are not sensitive anymore and require me to really press on it to activate it. What is wrong? Is the only thing i can do is to sent for warranty?

And it's all my keys that i use often to game with, i bought it in February, so what keyboard should i buy next? Any brands that can last longer then this? Heavy user here.