That's interesting. I do in my Custom One Pros (very similar in sonic performance I found).
It comes and goes now and again. I've now come to the conclusion that the driver needs to cool down after extended bassy periods, so to say. It seems to do the trick every time, but it's annoying because I can't use them while they're all rattly.
That being said, they're brilliant headphones. I listen to all the music you do, and also use them for 7.1 Gaming using Razer's programme. Outstanding performance. Recommended, but maybe a bit to pricey for yourself.
You could have a look at the Ultrasone HFi 580s - what put me off at the time was the lack of the detachable cable, but that's only because my cable gets snagged on quite a bit.
Yeah ive read that. I for one literally sit on my computer listening to either people talking, music or games, sometimes all at once, for like 12 hours a day on average. I can be fussy so the rattling would piss me off, especially if I had to let them "cooldown" After everything I think im gonna go with the ATH-M50s. If they sound decent without an AMP ill get it that way, if not, ill buy the little Fiio portable one.