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Hi Urs and welcome to the Forum. I've experienced that screen freeze when I disconnect from the USB after transferring a book over to the reader. Normally, I just have to wait a few minutes and it unfreezes. I've also been able to unfreeze it by reconnecting the USB plug and leaving it to its own devices for a few minutes then disconnecting.
Other, more experienced forum members can probably shed more light on the subject.
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