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will not open or shut fully in cold weather

When the temp dips below 40 degrees F the opener will not fully open and/or close the door.   The door operates freely when releasing the trolley.  It simply stops.  It does not reverse direction.  Reattaching the trolley results in partial operation.  Putting slight pressure on the door to either raise or lower it results in the operation completing successfully.  The adjustment is cranked up fully.  

Ideas?  I removed the case and I do not see anything binding nor to I see excessive amounts of lubricants.
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