Hexa crash at maiden flight

I am new to ardupilot , I sincerely apologize if my the errors are very basic.
I would be grateful if anyone could help me analyse the reason for the crash.
I also realize of making a mistake for flying in the house parking area .

Are the following reasons for the crash of the hexa or/and I am missing some from the analysis.

  1. Vibrations are more than 30.
  2. Due to sudden drop of voltage , Bat failsafe triggered RTL and hexa toppled over the attic.
  3. EKF variance, & EKF Primary changed.
    • NKF1 , NKF6 & NK11 are not showing similar curve for pitch and roll respectively.
      Can anyone share what could be the reason for not having similar curve, Why EKF are showing different estimation. But All the 3 IMU are having same curve.

Why was Motor interlock enabled for some duration and disabled?

I have attached some graph, Link to video of the crash & Link of the Log file.

Log : https://drive.google.com/file/d/1U4Hf9W9AzqzSML2pftKYQiJ68lr-kHI1/view?usp=sharing

Video : https://drive.google.com/file/d/1gPzIGaYG3vfYlM9tj_t4928Q730ydIL-/view?usp=sharing

Thank you :slightly_smiling_face:,