How To Soft Reset Windows Phone
Windows Phone Soft Reset
The soft reset is the same thing as pulling your battery (on devices where that is possible). This method will not remove anything at all from your phone and is completely safe to attempt in any problem situation.
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You perform the soft reset by having your phone turned on. Then press and hold the volume down 
and Power 
buttons until your phone vibrates and restarts. Note that you should not touch the device screen during the process (not even when the ‘slide down to power off’ prompt appears).
Example of situations where the soft reset should solve the problem:
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- An app that usually starts won’t start
- The camera won’t open
- The device starts using too much battery
- The device starts behaving oddly