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Try settings-apps-all-camera,force stop and clear data.Restart the device.
In maxmaxmaxmax's case in particular I would advise reloading the firmware as this indicates that the update did not apply correctly:
1. Download the PC Companion software from http://www.sonymobile.com/gb/tools/pc-companion/
and install it on your PC.
2. Install and open PC Companion then select Support Zone.
3. Phone Software Update.
4. Start.
5. Repair Phone
6. Continue
7. Accept data removal
8. Next
9. Wait for prepare
10. Select Phone
11. Follow the connection steps
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I alread find the solution to fix the problem. I uninstall 2 apps out from my phone. I cann't remember the exact name of those 2 apps. They're about the music or tv streaming. Thess 2 apps were pre-installed from the factory (my phone is 4g model from Taiwan). After uninstall those apps, the camera works very well and quick start.
Sorry I cann't remember the apps'name exactly. The apps is not in English language. May be chinese or korea, i'm not sure. If you can tell me the way to see the already-uninstalled apps (deleted apps), I will be able to tell you the exact app names that I deleted to fix this problem.
Hope you find that apps, good luck