Gamecenter Connectivity Issue in Sandbox mode

When I try to start a multiplayer game in Gamecenter (Sandbox mode), the flow get stuc开发者_JAVA技巧k after the user accept the invite. It shows "waiting" at the inviter end and "Connecting" at the invitee end. It's happening randomly and it get connected 1 out of 10 times. I checked for Firewalls, and there is nothing in between the two devices. What will be the possible issues? Is it because of Sandbox mode?

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You might consider this thread in the Apple Developer Forum:

https://devforums.apple.com/thread/199452?tstart=0