For some reason, only occaisionally will a friend actually join my party when I invite them, and they accept the invitation. Whenever they accept the invitation, they are removed from their lobby/game, and stay at a black screen for 5-10 seconds, then get the 'unable to connect to server' message..same happens to me (most of the time) when they try to invite me.

It can't be our internet connections because me and my main party-up-fwiend's wireless routers are near our PS3s...

Anyone also get this problem/have any advice?

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"I can't even aim straight, I think I had a little too much to drink tonight guys."
- Anonymous drunk COD4 player.

I get it too, but it's normally because of the nat type. If you have nat type 3, then you'll get this problem/