A soft reset (turning the device off then back on) is similar to restarting a desktop computer and is one of the first steps in troubleshooting a device.
In most cases, a soft reset won't affect data on the device, unless the battery is very low.
Press and hold the Power button until the Power off prompt appears then release.
If the device is unresponsive/frozen, press and hold the Power button for approximately 10 seconds or until the device power cycles.
Tap OK to confirm.
The process may take up to 90 seconds to complete.