Connection issue is always happened all the time, looks like the team did not learn what's the proble from the server. "Game session has ended" will always appear at least 3 times in a day without any clear reasons why it is happened and the players need to log in back to game because of it. The customer service on facebook is really bad, they just seen and read the message of problems and leave it, there is no follow up or maybe at least confirmation that the team will up.