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it might be just a problem with electronics/system of IREX devices - I am not Vizplex expert, but with a bit of my technology background I can tell that it may be just faulty design of eletric field that manages the particles making them fade in time... or any other "not-quite-as-desgned" usage of the epaper by the electronics in the device...
that is the version i'd stick with unless there are reports of such issues from users of other vendor readers...
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