Maiden & Crash E-Flite Carbon-Z T 28 2m

Maiden & Crash of my friends E-Flite Carbon Z T 28 2m. The plane flew great and without any problems. After take off to the third flight, the left main gear retracted only half way. Another cycle fixed it and it retracted completely. One minute after that, a sudden brown out appeared and it went straight into the ground. Strangely, the retract came out unintentionally after the brown out. What happened, any ideas?