I used to use this app perfectly fine on my old phone, but now on my new phone it logs me out and deletes all of my books every single time I close the app. I have to re-log in and redownload all of my books every single time I open the app. It's useless to me like this. I've tried everything. Uninstalled, reinstalled, cleared cache, restarted my phone, etc. Please fix it so I can read the books I buy from you again.