Same problem, COD for PS3 only works with 2310 on reboot

At one time and for only a few hours it worked by itself. My management to the router stopped working though. So i did a reboot on the router, then it was back to the exact same problem, where a reboot to the router was necessiary to be able to get online gaming to work and i had to be in the waiting for connection state on the PS3.
Generally i have to try the connection first, and then while waiting, reboot the router.