Apparently it’s been longer than I thought.
Currently I"m using a Duncan Metal Drifter. The stickers look fine and the string seems ok, but why did it stop retracting back to me? Any advice on how to fix it?
Probably because the response pads wore out. That happened with mine along time ago.
You can buy new ones here in an 8-pack. http://shop.yoyoexpert.com/product/74/Duncan-Friction-Stickers Use the Standard Friction Stickers.