This 'lost connection' thing is very annoying when you are doing something 'important' in the game or when you have a match in a few minutes. I had this 'thing' a decent amount of times. It seems to occur a lot more on the first day during the period of the first Cup matches.
One more problem is that the act of logging out and logging in again or loading the game again, and to rejoin the match seems to have an effect on the course of the match, most probably due to a random switch programmed to occur in there when a user joins a match. Sometimes the effect is clearly negative.