Garage door opener malfunctioning

Our garage door opener starts to close the door and then when it's a foot from the floor it goes back up. There is nothing in the way or blocking it. The sensors are lined up. It started to close again today and then stopped working again.

Is there anything swinging into the path of the sensors safety beam during the time the door is moving?

Is there anything causing the door to bind when it is nearly closed?

Are the limit switches adjusted properly?

Closing force?

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