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Look in your power settings.. First option is "Automatically go to sleep after: " (Default 15 minutes. Second option is "Automatically power off:" (default,) never.
Change power off to something. I think one hour is a good compromise.
The downside to this, after the device has powered off, it has to do a complete startup sequence. On the upside, if there's a runaway process draining battering even when in "sleep".. being powered off will resolve the situation.
If your battery still drains while the power is off, you have a deffective hardware.
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