Crash after fordward on Altitude Hold

Hi,

I´m desperated about this issue. My quadcopter has fall down 3 times about this issue.

My config is, Tarot 650 Sport

8000 mah 4S

Afro ESC 30a

Turnigy 4108 480kv

15x7.5 CF props

2,7 kg AUW

Controller and video with second baterry, 8000 mah only for esc an

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