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2 - 3 years ago my garage door developed a similar issue where the door would often only open maybe 1/3 of the way before it thinks something is obstructing its path of travel, and then it'll close (completely) again. Usually when I manually assist the opening (by helping to lift the door as it goes up), it would usually open the whole way.
Over time, the problem got worse to the point where it isn't really functional anymore, so I called in a garage door specialist -- J.Mac Doors -- and the owner Jim figured it out as soon as he had a look at it.
As it turned out, the door was somehow flexing near the bottom middle part, perhaps a meter up from the bottom. As the door was being pulled open, the flexy part dipped down, and according to Jim, that was enough to offset the angles of the rollers to the point where the garage door opener thinks there is some sort of snag, so it trips the safety mechanism, stops, and closes the door again.
He fixed it by replacing one of the existing horizontal braces with a longer, beefier piece. The door didn't flex anymore, and it opened and closed as it should.
If you need help, I wouldn't hesitate to recommend J.Mac Doors. He is very well reviewed in Google, and the reason for that is obvious.
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