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Just to be complete:
I reported a drain of the battery with a large epub open.
Yesterday I left the device with a rather small epub (ca 200pages) open.
This morning the page was still displayed but the battery was completely dead. The dr800 responded to nothing I did and needed charging for some ten minutes before it responded to the on/off switch and started to show that it was Charging.
So there seems to be difficulty in starting the sleep mode automatically.
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