Constrains don't work right or am I using them wrong?

Hey,

http://gyazo.com/31f2c5746e8f78f43e753d78473d9e8c

as you can see whenever the constrained part stops moving it freezes and unfreezes after moving for a while or jumping. I'd like to know how to fix this or if there's another simple way to make a ponytail.

I tried using all types of constrains but it's the same...

Here are the properties:

http://gyazo.com/003f0b5ace13331c1ab54562987e6ffc

Thanks for reading.