So me and a friend wanted to play online together. He made a party mode server and invited me, it starts loading then comes up with "Gaming session ended, returning to single player." I tried making a server and the same thing happens to him when I try to invite. I tried making a free roam server and inviting him, same deal. Even tried making a deathmatch server and inviting him, although I hear you can't invite friends to ranked matches. We tried this about a dozen times but had no luck. Anyone else having this problem or is it just me? I'm thinking it might be a router problem but everything should be fine. It's pissing me off quite a bit and we'll probably just resort to playing GT5P online instead.
Edit: I suppose I should point out this is the PS3 version, if it wasn't already evident from my PS3 username.