Pelase HELP me.... Idle 2 to the Left

I was just finish building 7hv and very happy, but time to test flight any problem. When normal flight and idle 1 heli ok very Stable, but i flip to idle 2 heli sudenlly bang,.. To the LEFT... I am panic and HOLD for safe landing.

My 2 unit 7hv all same this problem :(:(:( please help me..... Master...

This my setup :
- microbeast V3
- scorpion motor 560
- pinion 13 T and for other heli 14 revco
- bec quasar gryphon
- esc hw120
- servo jr ds8915
- rudder bls256 hv

Setting for heli :
- idle1 flat 70%
- idle 2 flat 85%
- setting beastx default for control bahaviour
- blade curtis 710 fbl
- tail blade on stock.

Now i was confuse and stress with this problem. And scared to test flight again :(:(
Please comment and advise.... Thanks.


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