Yes, it causes the app to hang at the end of the game. It does not silently close, nor communicate there is a problem. Just hangs.

Yes, but the app should close gracefully.
And "Error in replay server" indicates it is not a connection issue, but rather an error on the replay server.

I have the same problem. It happens occasionally, but it is frustrating as it hangs the app, and I have to kill the app from the other desktop.

Well, it's terrible. I haven't played a single game without disconnection today. I agree, players will leave faf if nothing changes.