Help! We had patched a large hole in the wall with a peice of drywall, the drywall tape, and then it was spackled over. We allowed the spackle to dry for two days. We then sanded and painted. And the paint cracked. So we spackled over that, sanded and painted. It CRACKED again. No one understands why. Two different cans of paint and the same reaction. We have no idea what's going on and we are about to flip! There are like a thousand little cracks. Can someone help?