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OK all I get most of the time is 'You have been signed out of PSN' so what I do is go to network settings on the XMB and go to were you have the option to Enable/Disable The Internet. All you do is Disable it and Then Re-enable it. I don't know what this does but I sometimes get disconnected and my internet is fine and this somehow lets my PS3 work again. If this helped anyone No problem in advance.