Ever pay attention to how much you use your wrist while chipping? One of the most common flaws in chipping, putting and even full swing is the overuse of your wrist in the impact zone.
Test yourself: take an alignment stick from the driving range and stick it into the butt end of a sand wedge, allowing about two feet of the stick to hang out. Now, starting with the stick against your left side, take a few small swings. If the stick hits you in the left side during the follow-through, your wrist is being too active (a flaw that is very common and leads to short-game misery). Make sure the left wrist remains rigid as the clubface passes through the impact zone. Practicing this drill will force you to keep your hands/upper body moving through the impact zone and produce better contact and consistency.