Sometimes, a once sleek interior door starts getting grumpy. Maybe the door won't stay open or close as easily as it used to, and you have to apply extra effort — even put your whole weight on it.

as it helps keep the door opening in the same plane. I always attach the hinge jamb first to the rough opening, and then work on the lockset side of the frame. I prefer to use No. 8 trim screws ...

solution is to remove and re-hang the door frames. Before you take this route, however, make sure you can salvage the existing casing, match it or replace it with a suitable alternative.