I can confirm that I have the same issue. I was using a manga converted using
Mangle. I am almost certain that I never pressed the '1' key. I did ,however, have no problems until I exited the "book" and then tried to go back later on. If I do the "hold power for 15 seconds" what does this do? If you are referring to holding it until it shuts off and then turning it back on, I have done this and am still having the same issue.