Why is my door misaligned all of a sudden?

Your garage door is misaligned all of a sudden due to a sudden failure or impact that caused tracks, cables, or springs to shift out of balance, as misalignment rarely happens gradually without cause. The most common sudden cause is being hit by a car, even at low speed, which bends vertical tracks and forces rollers out of alignment instantly, leaving door crooked. A torsion or extension spring breaking suddenly with loud bang causes loss of counterbalance on one side, making door heavy and crooked and appear misaligned overnight, as remaining spring cannot support full weight. A cable snapping or coming off drum causes one side to drop and door to be misaligned instantly. Rollers breaking or coming out of track suddenly cause binding and tilt. Loose track bolts that finally vibrated loose can cause track to shift suddenly. Opener carriage hitting obstruction and forcing door can cause misalignment. Weather changes like cold making steel brittle can cause spring to break suddenly. Water damage from clogged gutters overflowing onto tracks and rollers causing rust and sudden binding can contribute. Attempting to close door on object left underneath pushes bottom out and misaligns tracks. To determine cause, inspect tracks for bends, check springs for gap indicating break, check cables for slack, and check rollers. If spring or cable broken, stop using door and call professional for repair costing 200 to 600 dollars, as operating misaligned door can damage panels and opener further.