One: is moving off the ball during the backswing. That means, after you've setup, during the backswing you're allowing your body to slide, or drift towards the back foot, then on the downswing, you don't get back to the ball in time to make contact.
One solution: Keep at least 60% of your weight on the front foot during the backswing, so you'll not slide. Then you'll be able to make better contact. Two: Releasing, Flipping or using your hands to throw the club head at the ball hoping to get more distance. If this happens too soon, you'll throw the club face into the ground. One solution: Learn to use your shoulders to move your arms/club during the backswing, without hinging at all (ideally) or very much. Then, let the body's rotation bring the arms back down through impact, maintaining the shaft inline with the front arm, and a flat or even bowed out front wrist. You'll have to learn to do this without using the hands to throw the club head. You'll hit the ball more solid when you learn this. You'll get power and accuracy by accelerating faster when you know how to do it correctly.
Move Less ... Get Good! DUPLESSISGOLF