We have been seeing this a lot as winter is setting in... The truth is there might not be enough light available to capture good imagery using DJI's small aperture camera.
You could try slowing the aircraft down which will limit the smearing effect. Also, you could knock the exposure compensation down a step or two. Auto exposure is important to be able to use in aerial mapping but it can start to cause issues when there isn't enough light. Make sure you are mapping as close to solar noon as possible to maximize the available light.
Another thing to try would be flying higher since that will mask the effects.