Hinged shower doors remain the most favored of all shower doors. Two things that contribute to their popularity are that they are less likely to wear out, and that they are more easily maintained. This being said, they do at times require adjustment, to make them swing more efficiently. First, check to be sure the hinges have not been damaged. For a door that won't stay closed because the door hangs crooked, loosen the screws on the hinges, move the hinges until the door hangs straight, then tighten the hinge screws.