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Case:
I personally wouldn't ever buy a special case for any reader. The reader costs, say 130,- the case 50,-? The price-reality seems a bit distorted in my taste...
And for the next reader you have to buy annother case.
External card:
I would not use an external memory card in any case. Additional hardware - additional power consumtion. Even with a 100% working ereader.
Your problem with the reader:
Have you tried a complete factory reset?
Annother thing I would try is to make a comlete reflash of the firmware to sort out software-possibilities.
If after removing memory card, factory reset and reflashing firmware the problem persits, you could be sure it's hardware related. That would be bad luck.
A.
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