not sure, but for me using udev causes something like that. example: I can rip music off an audio-cd, but after some time (let's say half an hour...) it can't...seems like the drive is jammed or something. ejecting cd and inserting it again works usually....I think this is udev problem, for me at least (I've had others too)
so, if you use udev, check out google for your problem...if you use devfs, then I don't know :/
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