Drone not getting disarmed

Hey everyone i need some help with my drone, The issue is not happening every time and occurring randomly

I have done as per below following steps

  1. Was taking second automatic flight of the day

  2. Automatic plan completed successfully.

  3. Payload was remaining, so shifted to manual and sprayed manual

  4. After initiating landing procedure, landed the drone in loiter mode and did normal disarm procedure(.i.e throttle down).

  5. The drone was not disarming and instead the motors started to spin as if taking off, so switched to land mode and throttle stick down.

  6. The drone still didn’t disarm, so pressed motor killswitch(D button) which after pressing showed MotorEstop_Middle and the drone still didn’t disarm.

7… After a period of 2 mins, the drone disarmed suddenly. While this happened throttle stick was still down and land mode was there.
I am attaching the log file also given below
https://drive.google.com/file/d/1c-IjnDJJNDvFVRQdSipbgWM5k21M_yMo/view?usp=sharing