My quad reverse signals in mid flight.

Hi all,

Sorry for rushing in. This is my first post and I hope someone can help me understand what's going on.

I have a H-quad with:

Arducopter 2.9.1b

3S 4500 mah

ESC with Simon K

BL 2830/11 1000kv

10x4.5 CF prop

Flysky 9 ch radio

The quad is stable and flies

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