Soft reset can resolve issues like continuous resetting/rebooting, device crashing, freezing, won't ring or vibrate, can't make or receive calls, 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. A soft reset won't affect data on the device.
Press and hold the Altkey+ Delete + Right shift key for seven seconds.
Alternatively, press and hold both the Volume up key and the Volume down key for seven seconds.
The device powers down completely.
Allow several minutes for the process to complete.