I keep on getting signed out of playstation network. I can sign in for about 2-3 minutes, but the error code disappears. Then when I go back to the playstation log in on the playstation menu, I log in fine after testing my network connection and seeing that it's succeeded. And then, 2-3 minutes later, the error code is back again. The error code is 8002ad23. It's extremely frustrating as I just got Black Ops a few days ago, and now I can't even have a descent 15 minute game, help guys please.