I observed such a problem when connecting power 4 times on different autopilots. Firmware installed everywhere 3.6.11 (hexacopter) Autopilots everywhere Pixhawk mRo. After restarting the autopilot, the problem disappears. Can it happen again in flight. Because I have already crashed two hexacopters. Interestingly, everything was good before. Only the weather has changed - now it’s 0, -5 degrees outside and the firmware. Later I will try to attach the logs.
Crash logs https://cloud.mail.ru/public/3PMe/4mR5VXx2K