Hi ibangali,
Sorry to hear about the hindrance you encountered.
We are aware of an issue where the game loses connection when you make a change in the formation of your team and click 'SAVE'. Apparently it also can affect Live Matches. We are currently investigating the issue.

Please do contact our support team (you can reach support either by tapping the "?" button while in-game or by using the web form), so that they can register the problem while we are working on fixing it.