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Hi
Try to clear the data.
Settings > apps > all > Camera > clear data.
Remember, it's gonna reset every setting you did in your camera app
If the above doesn't help you, kindly go for a software repair as it would help your phone to get free of glitches and lag and improve performance and user experience.
Here's how. And do not forget to backup everything before performing a repair 
Update / Repair your phone via PC Companion
Download PC Companion and install it. Do not connect your phone until you're asked to do so.
Launch PC Companion > Start Support zone > Start Phone/ Tablet Software update > select Repair my Phone / Tablet > Follow the on-screen instructions it shows.
Hi jake30,
Have you tried clearing the data for Camera under Settings > Apps > All > Camera?
If the issue has occurred after the update then you can reinstall this latest update with PC Companion - this is likely to smoothen things out for you.
1. Install and open PC Companion then select Support Zone. (If you can unlock the phone then you can do a backup first as this process will delete all user data, just click Start under Backup & Restore and follow on screen instructions).
2. Phone Software Update.
3. Start.
4. Repair Phone
5. Continue
6. Accept data removal
7. Next
8. Wait for prepare
9. Select Phone
10. Follow the connection steps
Hope this helps! Keep us updated.
I am glad jake30.
PC Companion is a program made for Sony Xperia users, you can transfer media such as photos, music and videos through it, back up your handset, sync your contacts/calendar, update and repair the software etc. Running a software repair on PC Companion like I suggested would re-flash the software as it removes & reinstalls the operatinf system of the device.