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I did more trial and error and it was a NeoReader issue, not s book issue.
NeoReader can have 4 books opened at once. If those books are 4 epub or 3 epub plus 1 pdf everything works fine.
As soon as there are 2 PDFs opened in NeoReader it prevents the stand by or power off, the screen will turn off but the device and NeoReader will work in the background and drain battery.
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