I had a similar problem and found that adjusting the sensitivity force on the motor helped. It's covered in your owners manual or you can look it up online. On my opener, there's a opening screw on one side and a closing screw on the other. Both are marked. I gave the closing side a half turn clockwise whenever I had a problem with the door not closing. I had to repeat several times until it was trouble free. You don't want to go to far because you want the door to stop if it meets an obstruction on the way down (like a kid or pet).
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