There was a problem connecting to the patch server.
When you start a network-enabled game, the PS3 system will connect to the patch server to check if a new patch for the title has been released. If the connection fails, the PS3 system will sign out of PlayStation Network.
Solution:
Exit the game and start it again.
If the game will not launch, attempt to connect at a later time.
For more tips and hints on using your PlayStation system, visit our technical support forums at community.eu.playstation.com.
Due to staff availability, customers may experience delays or disruptions in their ability to contact PlayStation Support.