Chicago-
Be sure to check the door motor brushes.
Closing torque
Close start settings
Dragging gib
Too slow a manual close setting
Marginal DCL input
Soft spot on the primary door belt right near full close
New belts= excess drag on motor= 1041
Be sure you don't have a door ramp preventing full door closure
Or---
If it uses that magnet on the header for DCL, that may be a culprit as well.
Be sure to let us know what you found to remedy your trouble