But occasionally, the power button may be not working as expected. You may have to use button (key) combinations to power off, power on or restart Galaxy S9 or S9+.
This Galaxy S9 guide explains how to reboot, power on and power off Galaxy S9 and S9+ in both normal situations and abnormal situations (e.g. when Galaxy S9 or S9+ hangs.).
Please note, in this guide, we do not differ reboot and restart. They are used interchangeably.
Why do you need to reboot Galaxy S9 or S9+ periodically?
You may know you have to reboot Galaxy S9 when you update the phone. In this case, some system files being used have to be replaced. Therefore, you need to “stop” the system, then restart the system with the updated files.
For apps, normally, it is not necessary to reboot Galaxy S9 if you update them. Apps in Android are running in its own container. The system can destroy the container and then reload the app with updated apps on Galaxy S9 or S9+. Therefore rebooting Galaxy S9 or S9+ is generally not required for updating apps on the phone.
But some tech guys may tell you to reboot Galaxy S9 or S9+ periodically (from once a month to once a week, NOT daily) to make the phone more responsive.
This is actually a valid suggestion.
When you reboot Galaxy S9 or S9+, all app leftovers (some apps sometimes may fail to clean up their own files after you close them) and ghost processes will be cleaned.
How to automatically reboot Galaxy S9 or S9+?
Samsung added the feature of “auto restart” feature in Galaxy S9 and S9+.
You can enable auto restart on Galaxy S9 and S9+ in Settings — General management — Reset— Auto Restart.
As shown in the screenshots below, you can enable auto restart so that Galaxy S9 or S9+ will be rebooted automatically within one hour of the specified time.
You can only set the schedule as once a week only. Frequently restarting/rebooting Galaxy S9 and S9+ will not be helpful.
How to power off and reboot Galaxy S9 and S9+ with the power button options?
The safest way to power off or reboot Galaxy S9 or S9+ is using the power button options.
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