I had a bad crash yesterday when my quad lost GPS and the autopilot switched to optical flow despite it being disabled (and actually not having or ever having one). The GPS failure is obviously the triggering event and I’m suspecting of a bad cable because it shows No-GPS status. It’s the second time it happens in this quad but last time it was just a ‘forced landing’. What I’m really surprised this time is why it switched to optical flow. After that the copter just went mad (I guess for trying to use optical flow without any sensors), showed EKF variance and FAILSAFE_EKF-1 and a Land command, which it never did because it just lost control and crashed.
I’m attaching a screenshot of one plotted graph and a link for the dataflash logs. Some insight will be highly appreciated!