Sony Ericsson DCU-60

The DCU-60 is a USB cable made for Sony Ericsson phones that use the FastPort connector.

Cable problems
Many people who purchased a new-old-stock DCU-60 cable have reported that the silicone cable coating has dry rotted, and will begin to crack and fall off after a few days of use. This leaves the cable vulnerable and may cause it to stop functioning entirely.

This is the only Sony Ericsson accessory currently known to do this.

(Author's note: I bought a DCU-60 twice and this happened to me both times.)