Physic bones stuck in place

Hello !
creat a physic for the bones of the cloth of my character, the issue is all the serie of bones of the left cape stay stuck in place when i’m idle for a too long time. a little like if it get stuck when they recover there original pose.

  • I tried to modify the weight and other parameters but nothing change.
  • it works correclty on the other bones series like the mid part and right part without any bug
  • i try to recreat a new physic asset but the exact same bug happened
  • it happened only when i play

(i’m using unreal 5.03)

Thank’s for your future help o/