In order to prevent injury, garage doors automatically reverse if they come into contact with an obstacle. When the door closes halfway but then reverses for no apparent reason, this may be a sign that there is something preventing it from closing, something that you can't see. Check the tracks for stuff like dirt, rocks, bits of trash, or other debris. Give the tracks a wipe-down to dislodge anything that might be getting in the way.
Unfortunately, if the metal contraction happens quickly — for example, after a rapid freeze — the contraction may actually cause your door track to bend. This is a much more serious problem, and may require repairs further down the road. However, if the bending in your track is minor, your door will still function properly, even if it does make a little more noise. https://m.youtube.com/watch?feature=player_embedded&v=Z_eZc-kh40c
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10.5 If the spring comes loose from the cone at about 6 turns, you are probably winding the spring backward because the springs are on the wrong sides. Switch the springs. Otherwise, after winding the torsion springs, you will need to stretch the springs and secure the winding cone. First, mark the shaft 1/4" beyond the winding cone with tape or with a file. We stretch the springs because the shaft floats horizontally between the flexible end bearing plates as the garage door operates. Although this may be as little as 1/4" the binding of the coils as the door closes often keeps the door from closing completely, especially when the springs and bearings are dry and need lubrication.