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 and Volume down button (left edge) until the 'Power off' prompt appears then release.
If the device is unresponsive or frozen, you can follow these instructions to perform a reset.
To confirm, tap Restart.
Allow up to 30 seconds for the reset to complete.