UPDATE: Activision is working "tirelessly" to fix the online issues currently affecting Call of Duty: Black Ops 2 PS3 owners.

In a statement issued today Activision called on those affected to help it sort the problem, which is causing some PS3s to freeze.

"We are aware of the system lock-up issues that some players are experiencing on the Playstation 3 platform in Black Ops 2 at this time," Activision said. "Our entire team is working tirelessly to resolve the issue as quickly as possible."

These are the issues Activision is targeting:

Entering a public multiplayer lobby and observing a system lock-up.

Entering a public multiplayer lobby and receiving the error, An error occurred while trying to find a session, please try again.

Activision asked those affected to fill out an online form to provide more information.