Some of my doors are starting to rub against top of the door frames if they are single doors, or rub again each other if they are double doors. The house was new when we purchased 4 years ago, everything has been working fine no issue. Upon inspecting the doors are giving me trouble, I've noticed majority of the hinges are loosened up. I thought no big deal, just tighten the screws. When I started to tighten the screws, most of them cannot be tightened, the threads on the screw holes are stripped. The bozo contractor whom the builder hired apparently stripped most of the screw hole threads. I enlarged the screw holes, and plugged them with wooden plugs I got form a local hardware store. Unfortunately, the plugs were made with really soft wood, the hinge screws easily stripped the threads. After some search, I came across Widgetco, and they offer plugs made with hard maple. Hard maple is rated at 1450 on Janka Hardness Scale, which is pretty hard. I filled some of the holes with the new hard maple plugs, I have no problem to tighten the screws really tight, and now the hinges are firmly attached to the doors and the frames. I plan to check out all the doors at home, and fix any door with this issue. The plugs are expensive, but well worth it.