Sticky Key

So I've had my Blackwidow v2 for roughly a year. All of a sudden my D key is not as smooth as the rest of my keys. The key still works but I have to apply more force when typing to use the D key. After roughly 5 minutes of not pressing the key at all the key seems to be almost stuck but with a bit of extra force I can push it down. The key is also no where near as clicky as perfectly functioning keys. I was wondering what the solution to fixing this key would be? I am almost positive it is the switch because I have tried the key cap on other keys and it has worked fine.