Hello! I just had the exact same problem: the button of my Glo HD stop working to put the device to sleep. I can use it to force a reboot if I press it for more then 15/20 seconds, and if I setup the e-book to shut down after some time automaticaly, to turn it on just takes the 3 seconds. So, the buttom seems to be good, but a single click doens't put it to sleep.
I never set the option for the screenshots, and also I've already made a factory reset and I install another SD card with a factory image that a user kindly sent me. The same happens.
So, could it be a physical problem, maybe the button works for the long press, but doens't work for the quick press? Or could be a software problem?
If someone know how to help, it would be nice. Thanks!!
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