Razer Hunstman Elite, letter c key is not working.

Hello Everyone, I have a problem just recently happened. I have a Razer Huntsman elite for over a year now and have not received a problem just now. Earlier this morning, my letter c key does not function. I have tried all the advice from Razer website but it did not do anything. I have tried ESC, CapsloCk, SpaCe, and reset my keyboard. It did not work, however, when I was almost about to give up. For some reason, it worked again. Now, I was sleeping when I woke up and tried to use my pC. The letter C is not working again. Need help from the experts please. Sorry for my bad english