You've probably heard the phrase "getting stuck," but what does it mean? When you pull hard with the left hand on the downswing, the club tends to flatten and fall behind you. It also opens the clubface, so you have to quickly flip your hands to hit the ball square.
Instead, start the downswing by letting your right arm drop straight down and your left forearm rotate toward the ground. This will keep the club on plane through impact. Your arms will feel "short" and very connected to your body turn.