Fly it again.......
If it does it again, look at the ESC and see if it is "pulsing" on and off. It so, this indicates that the low voltage cutoff has activated.
Besides being a potentially defective ESC, the following can be the cause:
1. Battery is under spec C rating causing low voltage after a straining maneuver
2. Cold outside temperature
3. A cell could be weak on the battery and fall below the cutoff threshold. Battery will still read good after it recovered but will fall off quickly in flight.
First thing to do is isolate with the above info by flying.
Second is use another known good battery and see if it happens again.
Third, check all connections and make sure there isn't a cold joint on the leads to the ESC.
Let us know and we'll try to help solve your issue..... a little more history on the heli will help too!
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