Answer
Check the payload position and balance, mount drag, propeller and motor condition, and airframe alignment before treating the asymmetry as normal.
Explanation
The timing of the change gives a useful troubleshooting clue.
Drone exam · UAS flight performance
Check the payload position and balance, mount drag, propeller and motor condition, and airframe alignment before treating the asymmetry as normal.
The timing of the change gives a useful troubleshooting clue.