All golfers go through slumps. Typically most golfers will feel the effect of those down periods when hitting the ball from the fairway or short rough. Instead of hitting through the ball, they will lunge at it or lift up as they come through the ball. Learning to hit the ball squarely or "flush" every time will get you through those slumps.
Take your normal stance. Make sure you have a slight knee bend, and bend at the hips with a straight back. Your head should be slightly right of the ball, and your shoulders should be tilted with the left shoulder an inch or two higher than the right. Focus on the back of the ball and make sure you are looking at the bottom of it as you begin your swing.
Turn your shoulders as you start your backswing, but don't allow your hips or body to slide to the right.
Begin the downswing with a weight transfer to your left foot, but keep your head in position just behind the ball until your club makes contact with the ball.
Allow your head to come up after impact. In an effort to keep their heads down, amateur golfers keep their heads in place too long, which can result in injury.