The normal breakdowns that occur in an RJ45 Connector involve the broken root of a winding spool, broken interior of a wire wrap, etc. 76.9% of problems are the first kind, which you’ve experienced. If you can maintain the root of the winding spool well and avoid coils from breaking, the reliability of the product can increase. The reason why this problem occurs in RJ45 Connectors is that the product consists of a wire wrap and plastic case. The wire wrap is made of a magnetic ring and enameled wire with 0.09mm diameter, which works as a filter in the circuit. The end of the wire in the wire wrap should be peeled off, before it is winded onto the spool. The method of peeling the enameled wire is by dipping the end of the wire into a tin stove with high temperature, so that its enameled skin begins to melt. Therefore, the thin wire becomes even more fragile, and sets normally on the root of the spool. You should avoid bending it while in use so that it will last longer.
Link to shop removed by moderator.