It seems like I can be connected to PSN from 2 to 15 minutes before this error occurs and signs me out with the error code 8002AD23. This can occur whether or not a game or application is in use - it's given that error after being idle since it signed on. The internet connection to the PS3 is still active and never falters; opening the internet browser is just fine. I only noticed this happening a week or so ago, perhaps two weeks ago, so I can't pin it on a update for sure.
60gb BC Fat PS3 / Firmware v4.31 / Wired Connection / United States (Illinois)
Things I have tried that have not ended the issue:
-Trying every viable setting in the network settings menus.
-Replacing ethernet cable.
-Disabled media servers.
-Removed symbols from profile message.
-Reinstalled 4.31 update.
-Restored File System.
-Connected to a different new access point.
-Created a brand new account on a different user and tried staying signed in.
Help or advice is appreciated. More info can be provided if needed.