are you talking about the cables with the right angle plug?
i bought mine during the amazon lighting deal on december last year, mine came with the straight plug, and so far, the cable have failed me twice, i've resoldered the plug once
after i resoldered the plug, the first time, i've tried holding my mp3 player in my hands (previously it was in my pockets) and also i've tried to reduce the stress to cable near the plug but turning the plug into a different angle every time i plug it in, but after all that, the cable still failed on me