What causes a violin or viola string to 'uncoil'?

You know how when a violin (or viola) string uncoils... well, I don't think that the right word, but its when. the outermost part of the string becomes undone. What's that called? Why does it happen?


Is there any way to prevent it from happening?





Thank you!

What causes a violin or viola string to 'uncoil'?
when you tighten your strings you have to make sure that you're peg is pushed in as much as it can if not the strings will slowly become loose
Reply:Do you mean at the top through the pegs or on the neck of the violin. As the strings age or are wound to tightly they can pop or unravel





Edit: oh, well I've never had that happen....do you mean the metal is unraveling.....are they cheap strings?