Hello, my gimbal is a three-axis gimbal with encoder, my current firmware version is v2.70b0, API V2; GUI is also 2.70b0, I have calibrated the sensor and encoder, the gimbal can be reached when the power is turned on The calibrated zero position, but after more than 10 seconds, the yaw axis suddenly started to rotate slowly, and the flight control did not send a command to it. I would like to ask what caused it?