This started to happen about 3 weeks ago, my two other friends are haven the same issue, we are all on vodafone mobile broadband and everything was fine up until 3 weeks ago. Our other (3rd) friend is on eircom broadband and we can all connect up with thim no probs, but when he leaves, we get kicked out of party. I have just been onto vodafone and they said all is fine on their end (settings and what not) Any ideas?? Could it be xbox issue?? Ip probs?? All our NAT types are open and we can play online no prob's, it's purely party chat and teaming up issues. Getting sick of it now tbh, what's the point in having a years sub to xbox and it not working.