As a new headfi-er, I've had my PK1's for around a week, and have been driving them around with that nice Fiio E11 amp, and by golly do they sound great. But just a couple of days ago, I've noticed that the PK1's left earbud has this nasty rattle (exaggeration, sure) when I move the cord around...

Would you be shortening the life of the cord by winding up the wire?   I mean, it does seem like there is some stress going on when it is wrapped around the wad of rubber...