Hello, I've been finally able to get my hands on an aluminum Daghetta and while it's all great I seem to be having problem with the lock. Occasionally it seems to simply stick and be quite difficult to unlock. I'm not talking about the backlock spring but the lock 'thumbstuds' that you use to disengage the backspring. I'm guessing this is because it is a new knife and it needs a bit of use to settle in, but I'm not sure this is the case. Is this normal for a new knife?