Sorry, two different types of “returns”. One means “return” it to where you bought it, the other means contact SanDisk who will have you “return” it to them.
As with most problems if they are easy to reproduce they are easy to determine a fix. This write protect problem is not reproducable. Many people experience it, on different machines and different OSs and different uses but not everybody and not all the time. It could be static electricity, low power voltage from the power supply, heat, bent wires, broken wires, dust. Anything. hard to fix if you don’t know what to fix.
