My house is 5 years old and is a two story. This is on a ceiling upstairs in a vaulted area of my home. We have an attic but don’t use it for storage or anything. I can tell it’s the drywall but would this possibly be something related to structural or something I can easily fix? I am still under a 10 year structural warranty with the builder, so if it’s that, I want to have them fix it. Thanks.