You could take the back of the case off and see if you notice anything obvious. I would not do much though.(void the warranty?). You might be able to look at the other stick and "compare". Because they are a little different in action, that may not help too much. If this is new, I hate to say it, but you may want to send it back under warranty. What a bummer at this time of the year[] Good luck....lownslo....