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I had the same problem dowloading sections of Audio Books. My X50V was plugged into a powered USB hub that was not plugged in. Plugging it in added enough extra power that the downloads no longer quit part way through. Since this seemed illogical to me, I gave myself futher proof by unplugging the powered hub again, but his time I also unplugged the other couple of USB devices attached to the hub. Now, even without external power the downloads worked.
Since some of these devices are just flash card readers (I don't have a multi format reader) they do not usually need to be plugged in. In any event when unplugged, these device's USB connectors are sitting right next to the hub, so it's no effort to plug them back in when needed.
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