Restarting your Android device occasionally clears memory and increases speed. It can also be a quick fix for minor issues, such as app crashes. To restart your Android smartphone or tablet, fix common issues.
Performing a Standard Restart
A "Standard Restart" means that you restart your device using the built-in software options. Press the power button on your device for a few seconds (usually top or right, but also left) to start the on-screen power-on menu. You do not need to unlock your device to do this.
The screen power menu options may vary slightly depending on the device and the version of Android you are using. Tap Restart if there is an option, then wait for your device to reboot.
If you do not see an option to reboot, go to the next method.
Turn it off and back on
You can also manually restart your Android smartphone or tablet by using the best practice of turning your device off and on again.
The effect is the same as the previous method A good alternative if your device does not have a restart option in the on / off menu.
As before, press and hold the power button on your smartphone or tablet for a few seconds to display the power options. Tap "Turn Off" (or the icon on your device) and wait for your phone or tablet to completely turn off.
If you have turned off your device, press the power button to turn it back on.
Perform Hard Restart (or Hard Restart)
If your device does not respond or you have problems restarts normally, you can perform a hard reboot (or a hard restart) instead.
Do not worry, that's not the case Corresponds to a factory reset. This option is just a more drastic way to turn your Android device off and on again. It's like holding the power button on your computer.
To do this, press and hold the power button for at least 20 seconds. If Android does not respond, your device will (normally) be restarted manually.
Remove the battery.
Elegant smartphones and tablets are in fashion today. Manufacturers now use integrated, non-replaceable batteries to reduce the overall size of the hardware.
If you are lucky enough to have a device with a replaceable battery and it still does not restart, you can remove the battery. We recommend that you try to turn off your device before you pull the battery.
First, carefully remove the rear case from your device. Every manufacturer has another way to do this. However, there are usually small areas where you can place your nail or a thin plastic spatula to separate the two parts. Avoid using tools that could damage the battery or otherwise damage the device.
After removing the battery, replace it and press the power button to turn it on again.
Use ADB to restart your PC
If the power button is defective, you may be able to connect your device to a computer and restart it using the Android Debug Bridge (ADB) tool. This Google-provided tool enables a variety of remote operations, including rebooting your smartphone or tablet.
First, you need to install ADB with the Android SDK along with your Android device drivers. You also need to make sure that USB debugging is enabled in the developer options of your Android settings.
RELATED: Installing and Using ADB, the Android Debug Bridge Utility 
Connect your device to your computer with a USB cable, open the command prompt or terminal, and then type
adb devices to make sure your device is recognized. If this is not the case, check again if you have correctly installed the drivers for your device and followed the setup instructions above.
If your device is listed, enter
and your Android device should restart. Normal reboot.
If all else fails, reset to factory defaults.
If you fix problems on your Android device, restarting should always be the first step. This is often all that is needed to get things back to normal. But not always.
Android devices slow down over time. If a reboot does not help, resetting to factory defaults may be the only way to get your device up and running again.