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Hubs historically have not been very often recommended for use with storage devices over USB. I wouldn't be at all surprised if there is a warning against connecting through hubs in the Kobo product literature... Further, even with a powered hub, depending on what you're operating through it you could be near or even slightly exceeding the current it's intended to supply thereby causing problems in terms of current supply and voltage drop.
You could, temporarily, unplug the other devices from the hub and see if that makes a difference...
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