Since the latest update the ebook being read has to be frequently reloaded to enable the next page to be selected. This happens whenever the tablet is put down or whenever another app is viewed. Never used to happen.
Developer reply
We’re sorry you’re experiencing this since the latest update. Thanks for letting us know — our team is looking into the issue. In the meantime, please make sure you’re using the latest version of the app, and contact our support team with your device details if the problem continues.