A soft reset can resolve issues like continuous resetting/rebooting, device crashing, freezing, device locking up, and keypad not responding.
This device has a non-removable battery. This process can be used to simulate a "battery pull" when the device is unresponsive, frozen, or doesn't power on.
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 of the device; above the volume keys) until the device powers off (approximately 5 seconds) then release.
Allow several seconds for the reboot process to complete.