If your are talking about your scope moving forward during recoil, I would try cutting a piece of black electrical tape to fit inside the top half of the rings. If thats not enough do the bottom halves to.

If the dimensions of your scope allow it, position the scope forward, so the turret housing contacts the the front ring. It will be impossible for the scope to walk in the rings.

If your talking about the rings loosening where they mount to the dovetails on the frame I've never experienced that condition and have no cures for that.