There may be a problem with your PS3 system user profile.
- Delete the PS3 system user profile that is associated with your Sony Entertainment Network account by going to Users and highlighting the user you want to delete. Press the Triangle button and select “[Delete] to delete the user. Please note that there is no need to delete your Sony Entertainment Network account.
- Create a new PS3 system user by going to Users > [Create New User] on the XMB™ Menu.
- Sign in to PlayStation Network from the new user profile to sync your trophies.
For more tips and hints on using your PlayStation system, visit our technical support forums at community.eu.playstation.com.