Help Tekken 6 network problem.

[bellafigura]

I want to enjoy to play Tekken 6 with other people.

So I tried to connect others and then could meet others.

By the way, Finishing all games, I couldn't go back Main menu from Network-Battle Lobby.

I was stuck and couldn't anything.

Finally, I had to restart Tekken 6.

Sometimes, I can back main menu, but it happens again, very frequently...

I really want to resolve this problem.

If you know any solution, plz give me some advice.