My Kobo Sage lives by my bedside desk, and it's usually the last thing I'm looking at before I turn in for the night. My routine is usually:
- Read until sleepy
- Press the power button on the back of the Sage to manually put the device to sleep
- Put the Sage into its protective sleeve and rest it (face-up) on bedside desk.
Sometimes, when I pull the Sage out the next morning, the book cover of whatever I was reading is now inexplicably upside down. It goes away as soon as I power on the device.
I *do* have automatic rotation turned on (because I periodically switch which way I'm holding the device depending on where I'm sitting and which hand is holding a mug of coffee), and I have noticed that sometimes putting the device down flat makes it switch rotation, so, that much is fine. What I don't understand is how/why the device is switching screen orientation when it's supposed to be idle/off.
My Kobo is set to power off after 30 minutes of inactivity. When the Kobo decides to transition between "Screen off" to "Power off", is it also taking a split second to detect screen orientation at that time? That's the only thing I can think might be happening, but I can't imagine why.