While it is possible that playing very popular games like COD4 online has a higher chances of getting playstation 3 8002a548 error because of high congestion on the game server, it is still a bit unreasonable why they are not able to come up with solutions on how to accomodate more and more online gamers who visit their site.

PS3 8002a548 error code: tracking the problem

When you get ps3 8002a548 error code frequently, it's time to do some tinkering with your system in order to determine the root cause. This is specially true if you have a router in your network connection. One common cause of playstation 3 8002a548 in relation to a router is that your router may be preventing you from being able to openly exchange information with the game server. This means that your own router may actually be blocking you from logging in to the PSN.