  I think you misunderstood. When you said that you used to be able to turn it off and on right away you wasnt actually turning it off. You were putting it into sleep mode. When you started getting the messages about "are you sure that you wanted to turn off the device" etc that is turning off the device and that will take a little time to start up again. To just put it in sleep mode just quickly slide and release and the screen should go blank until you slide and release again.  ON the reader turning it self off when you try to turn a page can I ask how you are charging the reader ie via USB or mains charging?  I think you misunderstood. When you said that you used to be able to turn it off and on right away you wasnt actually turning it off. You were putting it into sleep mode. When you started getting the messages about "are you sure that you wanted to turn off the device" etc that is turning off the device and that will take a little time to start up again. To just put it in sleep mode just quickly slide and release and the screen should go blank until you slide and release again.  ON the reader turning it self off when you try to turn a page can I ask how you are charging the reader ie via USB or mains charging?  