3dsmax biped prop issue

Unity Engine
1

I made a animation with 3dsmax biped rig. It has a prop animation

which is character throw his weapon(link with prop) and then hold it back.

the problem is when I exported it to unity character looks fine but prop shook rapidly.

there wasn’t any problem with a character doesn’t have many rotaion,

but this character has many rotation motion.

Any idea to solve this problem?

2

Provide a video please. and maybe an image of the hierarchy in unity.

Then I/we can help.