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When you copied your books over to the PC, did you remove them from the SD-card? Sorry if that sounds stupid. It's just what you are seeing is often caused by a device simply having too many books. If you haven't already, I suggest you remove all books, except maybe one, and see how that runs.
The other things is, with all those books, you would probably have something on there that 'bothered' the ereader. Ereaders are strange things. If you have a book they don't like, they can make the device behave strangely and lag. This can happen even if you haven't opened the book. Epubs are particularly good at this. Normally deleting the book gets rid of the problem. However, sometimes you have to reformat the device to remove the headache. I don't know how it works on a glo, but I assume you can do a soft reformat (from the menu) or hard reformat (by holding various buttons at restart) of the device.
Basically clear everything off and reformat the device. If that doesn't do it, then it would probably be a hardware fault.
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