CRASH! Help to understand. Copter 3.6.10 Cube Black

@samucs, yes, this is new for 3.6.10 but to be clear, the flight controller was locking up one way or another. The change in behaviour is just that it restarted and now we know it was caused by some kind of software failure. Hopefully we can get to the bottom of this. Txs for the report.