I've had a number of slaves over the years and they all function differently. One slave was super-submissive but had a moment now and again, (like once every couple of months) where she just wanted to be alone. One slave came out of wanting to be a sub easily if I did something she didn't like. My slave now is 24/7 and has been now for the couple of months we've seen each other so I think its permanent.

The point is that you are you. Don't worry about it. Just do what feels right for you. Always. Do not spend a minute thinking about what's normal in the scene. That will just grow you an ulcer and is pointless.