What's causing these interference bars on my video

Agree, prop shadow. Reposition and turn quad to avoid that position in relation to the sun.
Fly backward rather than forward to keep quad pitched props up out of frame. Difficult depending on wind direction.

I'm unfamiliar with what those cars are doing. What is that called?
 
Yep, definitely jello/rolling shutter. The best solution is to add an ND Filter.

The SRP range of BlurFix Air Filters have been specifically designed for the GoPro / Zenmuse Gimbal and only weight around 7.6g

Depending on the brightness, I'd look at either an ND4 or ND8

blurfix-air-top-2-500x500.jpg
 

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