Are you referring to the yaw, side to side movement that starts at about 0:43 in the video where camera poi/pov changes? Wind could be a good guess, however, have shot hyperlapse in 15-25+ MPH winds and dont see what you are getting there (e.g. where the poi/pov changes).
Even if surface was calm and at altitude was 15-20MPH+ typically you wont see yawing like that and change of poi/pov. What you would more likely see is the camera / aircraft poi/pov centered, while the aircraft moves up/down, left right bobbing in the wind. You would see more movement outward from the center as camera tries to stay fixed on center.
Your clips looks to have camera hunting or looking for something, more like when you have low light, trying to autofocus, or have seen before signs of gimbal issue needing calibration, or repair due to drift (have a P4P that has done that). With the drift issue, aircraft stays fixed, however gimbal will drift side to side.
To put the above into perspective (other than the camera/gimbalHere are two examples via E2P
first
snow/ice karting was a very calm day, no movement per say:
second,
evening, windy, note flag in background on the right (winds were gusting about 26MPH from the side (e.g. left to right).
Btw, I use UAVforcast which has wind profiles for ground and various altitudes including reg and gusts for your location or elsewhere. The free version shows 24 hour forecast, paid version is seven day forecast, great tool to have and use.