How do i get my iphone 5 camera to start focusing again?

Standard troubleshooting...

1. Try a Restart by pressing the sleep/lock button until you see the slider. Slide to power off. Restart by pressing the sleep/lock button until you see the Apple logo.

2. Try a Reset by pressing the home and sleep buttons until you see the Apple logo, ignoring the slider if it comes up. Takes about 5-15 secs of button holding and you won't lose any data or settings.

3. Remove apps from Recently Used list...

- From any Home Screen, double tap the home button to bring up the Recents List

- Swipe up on the app preview card to remove it from the list

- Press the home button when done.

4. If still a problem restore with your backup.

5. If still a problem restore as new, i.e. without your backup. See how it runs with nothing synced to it.

6. If still a problem, it's likely a hardware issue.