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Can you provide the link in Google play for the specific app you're referring to?
. . . I
I use Quickboot, but it sounds like Reboot is different. I really like Quickboot, works very well. You can also place an icon on your home screen called PowerOff. Just tap it and phone shuts completely down. Or, using the Quickboot icon, you can reboot, reboot into Recovery or bootloader mode. You can find the app here:
https://play.google.com/store/apps/...ations.quickboot&feature=search_result#?t=W10.
I really like Quickboot
Sounds like a bug in their app