Friend invites.

My friend invites me to games after I have played with him, and for some reason the invite won't actually put me into his game. So the invitation will pop up, and I will accept it, and I'll still be at the main screen. Nothing will change. Then, it'll pop back up later and say that the invitation will expire. As a side note, sometimes I'll join a game, and the person will immediately start the matchmaking, and the ingame lobby will either say "Joining chat" or it won't let me type into it.