On Saturday I launched my hexacopter another time. Things went as usual, while I was at STABILIZE mode and ACRO. When I had switched to ALT_HOLD the hexa suddenly stopped and fell down like a rock. I switched back to ACRO quickly and tried to catch it in the air. I had only partial success. My hexa crashed hard and frame was damaged.
I don't like such sudden crash with no visible cause. So what has happened? Here is the log, but I am not so skilled to find out the reason. Would anybody be kind to take a look?
May be the the reason is that I don't use neither separate BEC, nor power module but one of the ESC's internal one. The battery was not exhausted.