I can log onto MW3 or other games during the week, I can not log onto the network on the weekend for the life of me. I am using the wireless airport extreme with the latest update to it. I am not the most tech savy person so please be clear in the direction you give me. Thank you Coop795
Open AirPort Utility and set your AirPort Extreme Base Station for manual settings. Set the wireless channel manually to channel 1, 6, or 11. Experiment to see which channel will give you a strong enough signal to connect to the PlayStation Network from your PS3.
Any chance you could run a cord from your AirPort Extreme Base Station to your PS3 to test with? If it will work consistently with a cord, then you may need to go wired or get an AirPort Express to extend wireless range.