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feature matching video stream?

I am implementing a PnP camera pose estimation. It gives me back coordinates, but on each frame, they jump around a LOT. I believe that this is because the features I use are re-ordering/shifting.

So I have added feature matching between consecutive frames, but I feel like I am missing something.

My workflow:

Store previousFrame. Get currentFrame.

Run feature matching.

Use 2d features of previousFrame to get 3d features, and run PnP.

copy currentFrame to previousFrame and loop again.

I see a similar result, with the coordinates jumping crazily each frame. Is this the right workflow for feature matching? What can I do to improve the stability of my coordinates?