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Shut off your modem (if your is like mine, your router should be connected through that). Turn your modem back on in like 20 seconds. Wait 1 min. Got to your PS3 and set the network connection to wired. Save. Set it back to wireless and finish the set up.
This is only if your errors and network errors and you keep signing out. If the errors are when you run the game, your PS3 is probably about to break. I think is is $179 to fix out of warranty.