Looks like it is the word "doze" that is the culprit.
Ah, NOW I understand what you meant in your earlier post when you said that you were 'searching' for information on doze in 'Help and feedback' - I thought you were looking at all of the different Settings pages for something related to doze; you were actually searching for the term 'doze' within 'Help and feedback'.
And when it returned a result you selected it. Here's the translation if you're interested (Japanese to English)
:
To use the battery saver mode
The remaining battery level is reduced, to save battery power when not immediately charge a smartphone or tablet, you can turn on the battery saver mode. Automatically battery saver When the remaining battery power is low, you can also be set to be turned on.
If the battery saver is on
When the battery saver is turned on, the upper part of the screen and the bottom of the screen will change to orange.
In battery saver mode, the following operations at the terminal in order to save battery life is limited.
You can not use the Google Maps Navigation
Vibration, position information service, is limited most of the background data
App to synchronize, such as e-mail and messages may not be updated and does not start
To turn on the battery saver
You can [Quick Settings] or from the terminal of the Settings app  turn on the battery saver. [Battery]   tap the battery saver].
To turn on the battery saver, (it can be turned on at any time) [ON] and then tap the switch of [OFF].
To configure the remaining battery power is low become When the battery saver is automatically turned on, [automatically ON] Tap, [the battery is 5% or the battery is 15% select the.
Tip: The Android 6.0 or less, and then tap the battery]   [other]   [battery saver].
To turn off the battery saver
In charge of the terminal, battery saver will automatically turn off. By tapping the switch to [ON] and [OFF] of the terminal, you can also turn off the battery saver.
Related Links
Increase the life of the little battery of remaining amount
Increase the life of the battery
To check the remaining battery power
Consumable too early of battery
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