We have several interior doors that stick or won't completely close in the winter. We also get cracks in the drywall mud above the doors, so I think something else is going on besides just humidity changes in the door and frame. This is a wood framed house with wood trusses and a metal standing seam old-fashioned roof. I remember hearing a DIY radio show discussing the issue but I can't remember the solution. I think it had something to do with the wooden trusses in the attic. Any information is appreciated.