Get out of that shadow. You are not seeing the ball completely, and lose sight half way to your racket.
Solidify your stance, quit jumping around for no reason.
Sometimes, you block body shots moving the wrong foot. Right hip pocket shots, you move your LEFT foot sideways, not your right so your feet are close together. You want a WIDER stance, not a narrower stance.
Strange as it seems, your volley stroke on both sides is TOO SHORT. Backswing is fine, but you need to followthru at least another 18" on every volley, and especially backhand volleys.
Try to turn your shoulders to a more closed position on each volley, especially backhand volleys.