Why does my iPhone 4 die at random times even when the battery has plenty of life

after installing ios7 my phones keeps going dead while my phone still has power. I want to know how I could fix this. Is this a battery issue or a ios7 issue?

First try a Reset  ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least Ten seconds... (But can take Longer)... until the Apple logo appears. Release the Buttons
If no joy... Try a Restore...
1: Connect the device to Your computer and open iTunes.
2: If the device appears in iTunes, select and click Restore on the Summary pane.
3: If the device doesn't appear in iTunes, try using the Steps in this article to force the device into Recovery Mode.
From Here
http://support.apple.com/kb/TS3281
Make sure you have the Latest Version of iTunes (v11) Installed on your computer
iTunes free download from www.itunes.com/download
Note on Recovery Mode.
You may need to try this More than Once... Be sure to Follow ALL the Steps...
Once you have Recovered your Device...
Re-Sync your Content or Restore from the most Recent Backup...
Restore from Backup  >  http://support.apple.com/kb/ht1766
Note:
Also consider Deleting any Apps you have Purchased / Downloaded but you now never use...

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