andrewNZ: This appears to only be the AC cord (wall to figure 8 connector) for chargers with a removable AC cable, not the whole charger.
That's both reasonable and disappointing at the same time.
the only faulty part of the AC cord. It has poor strain relief.
It’s a common industry problem. Many OEMS have had similar issue with printers and laptops.
If your DC power adapter has failed, then can be replaced under warranty