problem with dynamic attachment

[Mickle]

I have a big of a problem, the rope is connected to a sphere as you can see in the video and i have a script on the sphere that allow me to move it around, the end goal is to just make it swing as you can see in the video, but when i drag the sphere too much, it looks like the rope is disconnected and it freaks out, this only happens when the i assign the attachment type to dynamic, in the case of static, it works fine but again, the whole goal is to make the sphere swing left and right so it should be dynamic