Originally Posted by RealAct
Yes, I have been connecting it and disconnecting it from the PC to upload new books etc.
I thought so, I believe the issue is around that area. The internal partition, and the SD card, are unmounted when you connect to the PC (so they become available to the PC). At that time, if the reader app tries to access the book, it would get an error. Maybe this is not being handled correctly and is causing the reset of the last page read.