In the ISS Expedition 56-57 Launch of Russian Soyuz MS-09, in the first view from the external camera at around 3:30, an obvious back and forth rotation (along the length axis) of the rocket can be seen against the earth background. Its amplitude diminishes until it is no longer visible around 4:30.
Is the rocket precessing? Why? And why does this precession decrease? Active correction?
Here is a video where you can see it from 3:15. I estimate fhe frequency of the phenomenon to be 0.5-0.7 Hz.