DON'T DELETE UR SAVED DATA!
There are 3 ps3's on a Net-gear wireless router in my house.
I played with the forward port settings, on router web page, (Not sure if i did it correctly, 2 unknown devices were connected so i just picked 1 and put in 3074) reset my modem and router, and then reconnected my ps3 to the internet.
Everything was working fine online/offline. I played with the hommie for abut 2 hours early this morning.
Now about 45min ago i decided to jump back on. Now its back to crap again (not working).
Thing is, the kids ps3 is now connected to the WiFi. But it was off when i was playing earlier...
Also... I've done everything in this thread to try and get this working and a little more. Hope it kinda helps