I don't doubt the er4s cable is better... It is. But the v1 cable doesn't fail often according to audeo as well as a bunch of reviews i'v read, and my first hand experience. I've had my v1 about a year now, and i'm careful with it, but i'm not "super" careful with it. I also use it all the time; Probably more than most people. The cable shows absolutely no sign of wear for me...
But i'm probably even less careful with my er4s cable. Again, i'm careful with it, but i don't baby the cable. The more i started using it, the more i started being less super cautious with it. It just feels solid. Can't speak for the black version, but mine feels great. The only thing i'm cautious with on any cable, are the stress points where the cable parts connect. I don't wrap or coil cables tightly where the parts join. Otherwise, i feel like i can use the er4s with less worry than most cables. I have even put them in my pocket sometimes without any case.
Anyhow, if your pfe112 is a year old they will replace it for you. I would contact audeo.
Nope, its not covered by warranty anymore, so I open the housing (its easy) and plan to recable. Now purchase some goldplated cable for my PFE.