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I've been seeing occasional sudden battery drain, I think there are multiple firmware bugs that can cause this. My feeling is that occasionally you get a run away background job and the battery drain is rapid until you power cycle the device.
Once I triggered this by doing a failed search in a PDF. A firmware update may have fixed this as it hasn't reoccured.
Quite frequently if I leave wifi on, it gets stuck in an update cycle, forever trying to do something. Sometimes turning off wifi for a while fixes this, but sometimes it keeps trying to update even with wifi off. Turning off wifi and then rebooting usually fixes this and it doesn't come back right away when the wifi is turned back on.
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