Our home was built in the 1930's. Our walls are plaster and wire. In the past 6 months, we have noticed a lot of cracking on our walls. We have tried patching them with plaster patch and spackle like compound. Nothing is working! In one of our rooms, it looks like the walls are shattered but they are not cracked or chipped. Any suggestions? I am starting to worry that we have a serious problem. Thanks in advance!