Have you tried going to GPS only and see if that stops it?
It's probably one of the services in Android OS.
Bet dollars to donuts it's the logd service.
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When using an Android monitor program under PROCESS column LOGD does pop up but difficult to get cumulative amount of CPU usage (and therefore battery drain) associated with it. I hope you're right and the next update to Marshmallow fixes it. I know one thing - something is wrong with Marshmallow on my G4. Losing 30% battery overnight when unplugged is unacceptable (and before factory reset it was much worse!). Under Lolliopop I'd lost maybe 2%. There's a leak somewhere.
1. Download quickshortcutmaker
2. Once installed, search for access lock in the app.
3. Create a shortcut for the home screen.
4. Open shortcut to LG access lock and disable the keep awake feature for whatever third party app you think might be keeping your phone from properly sleeping.
What acces lock screen look like:
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I wish I knew! I took this when I woke up this morning. There's some kind of memory leak. And by the way, I don't have a ton of apps installed.
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I hard reset my g4 on tmobile afyer marshmallow update and I haven't had any problems.
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