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The issue first popped up for me following these steps:
1. I turned on the light to read.
2. I didn't turn off the light when I put the device to sleep. The device light stayed on.
3. I noticed this straight away, woke the device and turned brightness to 0 before putting it to sleep again.
4. Device wouldn't auto-power off after that despite set to do so after 60 minutes. Battery is drained.
Software version: 4.4.9349 (6f700792a0, 5/17/17)
I've manually powered off and back a couple of times after that but the not-auto-powering off issue persisted... until today. There haven't been any new firmware updates, but now it would power itself off and doesn't seem to be using any more battery than normal.
I'd never set it to auto-power off previously, but I think I'll keep that just in case there are any more firmware updates and the battery issues happen again.
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