Wobbling is a fairly common issue in the Spider morph and I believe it is generally thought to be a genetic/congenital neurologic issue. That said, there is really nothing to do to treat it per say, and it I am fairly certain it is not really considered fatal (except possibly in really severe cases). As long as the animal eats then it should be all right. What you are describing sounds like a mid-grade wobble. I think I remember reading that stress or excitement tends to cause a higher expression of the wobbling, so you may notice it decrease in intensity a bit as your animal settles in.