Phantom 4 Pro yawing to left during mapping missions

My P4P is yawing during mapping missions.  It seems to always yaw to the left.  The actual flight path stays straight because it is an autonomous mission but the bird is rotating left and it should not be.  I have calibrated the IMU and compass with no luck.  There are threads out there for guys doing video shoots who have the same problem but since they are flying manually I would imagine they deal more with it drifting off course.  My problem is that the photos are rotating during the flight path.

If anyone has delt with this problem and knows how to fix it please let me know.  And to be clear, the whole drone is flying in a yawed position.   The problem is not a yawed gimbal. In the photos below you can see that it started straight but continued to yaw left as it flew.  I have had the problem in both Pix4D capture and Map Pilot so I am confident it is a bird side problem.  Any help will be appreciated.
 
In the linked photos, it flew parallel to the street and the building.  You can see the yaw get progressively worse.  There are 2 recent days of flying.
 
 
Thanks,
Tim
 
 

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