If you just bought it, you can possibly return the unit and ask for a replacement.
I do think that your books cause the issues you've mentioned.
When I read "epub, 30MB" in size. Well, that is a very huge one.
I just wonder how large the seperate files inside this epub are. Do these files exceed the 'recommended' maximum file sizes for epub?
It would certainly explain why it took so long to load.
Or even crash the reader… don't be surprised if it does.
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