After having such a successful day last week, I was very confident that I would not have any issues with my quad on this outing. Unfortunately, that was not the case. I had issues on my second battery pack and it put an end to my day.
I am not 100% sure what the cause of the crash was. I have often thought these types of crashes could be radio related, but, my battery alarm should have gone off if that was the case. In the crash, a motor continually ran and eventually burnt out, and caused the ESC to catch fire. You can see the smoke show in the video.
I am taking this rebuild opportunity to shorten my motor leads and retune and configure the quad from new.