Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Third set have failed.

These headphones work fine initially, but fail far too easily.I first a set 3 years ago, and liked the way they fit in my ears.Soon though, one side of the stereo started to fail. I jiggled them for months to get them to work until they stopped functioning altogether.I bought another pair and they failed after a some months of light use.Dumb me, I bought this last pair and THEY have now failed.I know, I know, fool me once... Except I didn't learn and went to thrice.The noise reduction works but produces a hiss that you really only notice between songs.My advice: There are so many better options. These seem designed to fail.