So far they have told me to rebuild my database but this didn't work for me. This is what they said:
1. Please check that the game(s) is/are updated to the latest version. You can do this by highlighting each game on the Content Launcher and pressing Options > Check for Update.
2. Make sure you are using the latest version of system software. You can check this by selecting Settings > System Software Update.
3. If you continue to have issues, then you will need to rebuild your database. Rebuilding your database helps clean up the data on your PlayStation device as it reorganises the storage. To rebuild your database start with the console off > press and hold the power button until you hear two beeps > select option 5 - Rebuild Database.
4. If you're still having issues, you will need to reinstall your console. Initialising your PlayStation device will delete all data. Before you do this, please back up your data using a USB or PS Plus Online Storage. You can find instructions on how to reinstall your console on our website:
https://www.playstation.com/support/hardware/reinstall-playstation-system-software-safe-mode/.
5. After reinstalling, please:
a) Reinstall the game(s). Please ensure you re-download using a wired connection.
b) relaunch the game(s) before reinstalling any game saves. It may be that the saved data has become corrupted, which is why the game(s) crashed.
6. If you own a PS4 and have replaced the hard disc drive (HDD), please reinstall the original (if you still have it) and try again.