We have two drywall cracks one hairline the other fairly large that reappear each winter even after patching over and over. The large crack pushes out all previous patching attempts each summer. We have used regular spackling, we have used caulk, we have used "Goodbye Cracks", and even have tried to put a long screw in a nearby closet (thinking the wall/ceiling has some sort of structural problem) but, nothing seems to work. We just have to start all over each season. Usually by now the hairline crack is gone, but not this year. The large crack runs next to a wide "doorway" opening on a cathedral ceiling and runs into where a regular 8' ceiling drops down it's about 12-15 inches long. Help!