What's going on with these joints?

Hi All,
Could anyone shed some light on what's going on with the joints in this clip?

I click to move the player object, and the player object follows the mouse. The player, shoulder joint, elbow joint, and forearm joint are all held together with either distance or hinge joints. When the player begins moving, the joints vibrate and begin to come apart.

There has to be a gap in my knowledge of how physics objects work in game. Any advice on this issue?

Thank you! Let me know if the question isn't clear.

 

So, I've done quite a bit of searching through the forums. I decided to make a more comprehensive post documenting troubleshooting efforts in the Physics forum. You can check it out here:

https://forum.unity.com/threads/troubleshooting-joint-behavior-in-ragdoll.513055/