Why Cant I Join My Friends Games (xbox Live)?

whenever i try to join my friends party or vice versa, we are prompted with the message "can not connect to xbox live party". also when he tries to join my game in Modern warfare 2 it says "lost connection to host for 12 seconds". the only time i can join his game is when there is a 3rd person who 1. sets up the lobby and 2. invites us to play

its started happening with other friends. how do i fix it?

Suggestion:

All of you should try restarting your routers. I get this problem every so often, and this tends to work.

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