Trying to scoop the ball airborne. Trust the loft — hit down and through, not up. The club's loft does the lifting.
Swinging harder with longer clubs. Swing wider and smoother — the extra shaft length adds distance automatically.
Ball too far back in the stance — forces a downward hit on the driver, killing distance. Ball off lead heel is the rule.
Trying to help the ball up by scooping. Hit through the ball into the ground. The divot (or brushed grass) should be in FRONT of where the ball was.