Official comment

It's a non-contact fader, so there could certainly be something else that has failed. The lifespan of that kind of fader isn't so much about the number of cycles, but moreso other abuse it may face (such as the fader stem being bent, slammed into either end, things spilled inside, component failure).
I looked on the parts page and couldn't see a full crossfader assembly, so it may be best to contact Pioneer DJ technical support in your region to have a local shop get you the right parts.