Circuitrocks

New build, second flight. 10 seconds in, one motor stops spinning. Bot crashes, ESC bricked.

Forum search says "ESC desync" but symptoms vary widely. My case:

• Motor was healthy on first flight (full power tested)
• ESC was running cool to touch before flight
• Battery sag minimal (4S 1300mAh, 75% charge before flight)
• No prop strike before motor dropped

ESC dead after recovery, replaced. Worried this happens again. Common root causes:

• Bad solder joint on motor wire (mechanical fail under vibration)
• Firmware mismatch (Bluejay vs BLHeli on different ESCs of the same 4-in-1)
• Demag from over-current

Any FPV folks here can break down what to check before next flight?