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My camera keeps crashing, I have to restart the phone then I lose my photos
Can you try to clear data for camera app under settings-apps-all and restart the device?
Where are you saving the pictures? on the internal storage or an SD card?
If the instructions provided by Alexdon do not resole the issue please also try a firmware repair:
1. Before you start you have to download the PC Companion software from http://www.sonymobile.com/gb/tools/pc-companion/
and install it on your PC.
2. Once installed on your PC, double-click the PC Companion icon on your desktop to start the update.
Note! For some models you will be prompted to do a backup prior to the update and then restore.
3. Install and open PC Companion then select Support Zone.
4. Phone Software Update.
5. Start.
6. Repair Phone
7. Continue
8. Accept data removal
9. Next
10. Wait for prepare
11. Select Phone
12. Follow the connection steps
Don't forget to backup
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355