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I have a similar issue with the H2O and firmware 3.12. While reading in the sun (on the beach) or in airplanes during longer flights the reader freezes and it does not react to any swipe, touch screen is not working at all. Sleep button works. Putting it in sleep mode and wait for some minutes and it reacts again for some time but after a while the same problem. Reading at home no problem at all, reader keeps stable for hours.
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