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Perhaps a process gets started identifying or reading the card's contents and fails to shut down despite the ereader going into sleep mode? Maybe it's some sort of minor hardware or software compatibility issue with certain brands or the firmware has a bug that only shows with certain cards -might even be the card doesn't somehow follow the spec... though it seems likely Kobo could bulletproof whatever routine gets stuck with a timeout of some sort, or an override that shuts the microSD hardware down anyway. I think I recall seeing other posts about this sort of thing happening only with a certain brand/size card, possibly with the Touch.
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