I had a similar problem and fixed it by spraying WD-40 on the rollers and track. That should be part of your routine maintenance a couple of times per year. Also the poster that talked about the sensor lights being a steady light is right on. It may have accidently been kicked or otherwise moved and that will affect the operation of your door. Check it and adjust until you have a steady light. Adjusting the door opener to add force or amount of travel should be done in small adjustments, like a half turn of the screw.
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