I haven't tried since I installed 15.3b, but I found if I was using the pageturn app that the screen lock didn't work for me. So that could definitely be your problem.
If you set your reader so that on start it goes to the last page read you can start reading straight away. I just make sure that I read to the end of a page, turn the page and then turn my reader off. When I start it again it comes back at the new page and by the time it paginates, the next page can be turned. You don't drain your battery and you always have a page ready to be read.
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