Not sure what your wifi issue is/was but I was having problems recently with connecting the PS3 to the wifi (my PC connected fine though my Galaxy Tab struggled too) and it resolved when I turned the router off, unplugged it for 5 minutes, then plugged it back in and turned on (found out this after I had assumed my game/PS3 had issues and did a full system format and lost my save game as didn't back up lol)
I have tired rebooting the router and unplugging the modem but the PS3 seems to not want to find the wifi. Everything else finds it find so I think it is a PS3 issue.