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Thanks to all of you for your answers and feedback.
@davidfor, thanks for the confirmation. I remembered seeing a post on something similar a long time ago but wasn't sure, reason why I asked.
The book itself is a quite old epub and the content is not great, links for notes do not work, some formatting issues, spaces missing after words in italic, many issues which made me suspect this behavior could be due to the book.
My device is 2.5 years old (I bought it as new). I have another Aura One which is almost 4 years old and the battery is still very good so it was strange to see such a change overnight.
To be complete and in case it could help in the future, I had noticed two other strange behaviors while reading this book:
- Once, I left my reader on with the book open and for the first time ever, it didn't go on sleep for almost a full day (though it should go on sleep after 10 minutes and turn off after 4 hours, I am using the Custom Sleep/Power-off timeout patch)
- Each day I was reading this book, I noticed an issue with time. The clock was moving forward or backward by 12 to 20 hours (no change in timezone) and I had to resync the device.
- I thought these 2 may be related: clock changes unexpectedly and the timeout trigger doesn't happen.
Anyway, I finished the book yesterday and there was no battery issue since then. I will leave the book for the time being and see if it happens again and if it does, I will remove the book.
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