to much vibrations, motor screws came loose motor started to rattle and broke the prop.
Gear
ZMR250 cf
DYS 1806 2300KV
ESC Emax 12amp
FC CC3D mini me 14.10
Lipo multistar 4s 1400mah 40-80 c
Props GF 5040
Fatshark predator goggle
Fatshark fpv cam
Immersion vtx 25mw
Camera Xiaomi Yi 1080p60