How to untie the hair to let the hair dynamic fall

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Hi, i am noob for these part.

I have some problem as below:

  • the hair is “Jumping” around even the movement is stopped.

-it there any way to animate a untie hair from the start to end?

Screenshot (119)
Screenshot (119)1920×1080 294 KB

I do the hair dynamic on one piece with weight paint and collision object.

i do know the hair can be model separate then later joint to one, but if i do that i cant do the untie hair animation.

is there any solution on it?
it will be much appreciated for this.

Thanks.