Work on keeping the hands/wrists out of it. For chipping and pitching, concentrate on keeping the lead wrist flat/back wrist bent all the way through. Swing with the arms and upper body. The drill where you hold a stick or another club with your club extending it well past your hands is great as it forces you not to flip (or it will smack you in the side).

For putting, again hands and wrists are usually a source of inconsistency. Video yourself putting and make sure everything is lined up square. Work on staying still and only putt with you shoulders.