To reduce battery consumption and improve power efficiency during extended gameplay, Power Saving Mode will automatically activate after a period of inactivity.

If you find automatic Power Saving Mode inconvenient, 
you can disable it through the following path:

[Disabling Power Saving Mode]
 1. [Menu] in upper right > [Settings] > [Hunt] tab
2. Under [Controls] category, set [Auto Power Saving] to [Off]