When I first started using my Sony, when I would slide the power bar to turn it on or off, the ereader would either start or turn off immediately, no problems. For some reason though, now I have to slide the power bar multiple times both to start it and turn it off.  Also, now when I try to turn it off, rather than just shutting down, I get a message asking, "Are you sure you want to shut down this device?" which I never got before. And if I choose "no," the reader stays on. If I choose yes, I get an exclamation point while it shuts down. Then when I try to start it, rather than just turning on I get another message "Reader Opening."  Sometimes when I get it turned on and select the book I want, I'll use the page forward button to turn the page and the reader will shut down.  