It is not because of an ePub, as I only use LRF files. And it's not because of the size of the book either ; this started happening at around page 150 out of a 888 page eBook.
If I leave it alone for 5 mins, it resumes to operate normally, for about 20 mins or so, and then does it again. I'm almost done with this book and will see if it does it with another one ; then I'll try loading ePubs see if it does the same too!
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