In about 3 seconds after start engine stopped and I lost control totally.
Due to small roll and pitch angle my X8 kept flying and crashed in a tree in 300 meters.
Later at home I discovered that connector on a power module on the battery side came off from the wire. Terminals inside the connector had almost no trace of solder. On the wire solder attended and was highly oxidized!!!!
This means that the soldering kept on heat shrink tubing, and water has entered inside accident was only a matter of time and vibration, which is what happened.
I also cut tube from another wire and soldering quality on it also leave much to be desired.
Fortunately the aircraft be restored by the end of the week I will raise it again in the air (It amazingly strong!).
However, I will now have to check all the areas of factory soldering.