Egnos and HansTWN reported the failure of dr800 to go to sleep automatically along with high battery drain.
I have observed the same issues on my DR800S.
I had for several months no issues with v1. Since I installed v2beta I experience sometimes that the device doesn't automatically go to sleep. In one instance the settings screen was on and I found it a couple of hours later totally irresponsive and zero battery power coming from ca 75% when I left it.
The last couple of weeks I have seen this about a dozen times. The screen stays on, at a book or in the home screen or whatever and it seems to drain about 10% or more of power per hour. I don't read pdf's. What I am reading is a rather large (>900 pages) epub. When I resume reading that epub it takes very long to go to the page I was reading (about page 170). Normally I can put the device into sleep mode and then battery life is normal as in v1. I have no clue for the moment what triggers the inability to go to sleep mode by itself. But it certainly is a bug in v2 firmware.
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