I will assume that I got a defective set of connectors if at least five people actually remove their cables and closely inspect the negative contact for wear. You need to look for it. If you do not look for it with bright light and a magnifying glass like I said earlier, you will never know the coating has rubbed off. That contact is tiny! So LOOK for it.
So, if everyone can inspect all four connectors on a set it ICs, let us know how many times they have been inserted, and which connector you have (Classic, Copper, Silver, Pure, or Absolute), it would be helpful. Until that happens, you need to assume that the coating wears off of all of them after a few insertions, because I might be the only person that has inspected them closely after multiple insertions. I want to like these connectors, but it's hard when the coating rubs off so easily.
So, if everyone can inspect all four connectors on a set it ICs, let us know how many times they have been inserted, and which connector you have (Classic, Copper, Silver, Pure, or Absolute), it would be helpful. Until that happens, you need to assume that the coating wears off of all of them after a few insertions, because I might be the only person that has inspected them closely after multiple insertions. I want to like these connectors, but it's hard when the coating rubs off so easily.