The Most Overlooked and Common Reason For A Malfunctioning Garage Door

It's important that all of your screws and bolts are screwed in tight, especially on the moving parts of the door. Quickly go through all of the moving parts of your garage and tighten all of the screws and bolts to make sure your door isn't malfunctioning because of it. You'll find that your screw holes will become too large for the screws over time. To remedy this, fill the holes in using wood pieces called "wood fillers".

External Sources:
Quick Guide To Repairing Your Garage
Garage Door Screws and Bolts