A soft reset can resolve issues like continuous resetting/rebooting, device crashing, freezing, device locks up, and keypad doesn't respond.
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 (located on the right edge; bottom button when held in portrait) 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.