Here is one way to easily reproduce (it is not limited to this method, but this is the easiest I've found that "works" consistently):

1. Start punching and keep Fire button pressed
2. Press Vault button
3. Let go of Fire button

Result: Punching sounds will continue playing even if you stop punching and animation has stopped, sometimes for up to 20 seconds after you stopped punching.

Hey there,

this is a known issue and is already being fixed. It will be patched in one of the upcoming updates.

Thank you for your feedback!